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Oracle12c flex asm_flexcluster - Y V RAVI KUMAR

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The document discusses Oracle's Automatic Storage Management (ASM) and new Flex ASM functionality introduced in Oracle 12c. It summarizes the key points that Flex ASM allows ASM instances to run on multiple database servers, eliminating the 1:1 mapping between ASM and database instances. It provides examples checking the Flex ASM configuration and status from two database instances, showing Flex ASM is enabled and ASM is running on both servers.

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1 Patterns Oracle 12c Flex ASM & Flex Cluster PRESENTER Yenugula Venkata Ravikumar OCM, Head-Database Practice, Patterns 23rd AUGUST 2014 HYDERABAD, INDIA
2 Patterns ABOUT ME
3 Patterns AGENDA The History of ASM Benefits Of ASM Automatic Storage Management (ASM) Overview Flex ASM Flex Cluster Oracle 10g R2 Functionality Oracle 11g R2 Functionality Oracle 12c R1 Functionality ASM Cluster ASM Network ASM Remote Access Deploying the Flex ASM
4 Patterns HISTORY OF ASM Before Oracle 10g, Storage Management was provided by 3rd parties CUSTOMER CHALLENGES •Large databases required considerable storage management •Best performance required raw storage •NFS solutions, while simple, did not perform as well as raw •For RAC, cluster file systems were not available With Oracle 10g, ASM provided •Simplicity of management, even better than NFS solutions •Performance equal to raw disks •Support for RAC clusters THE SIMPLE IDEA OF ASM •Integrated volume manager and file system •Stripe and mirror files across disks in a ASM Disk Group •Automatic “Rebalance” •Built on the Oracle instance architecture •Manage storage as a global cluster “Shared Disk Groups”
5 Patterns BENEFITS OF ASM (1 of 2) I/O is spread evenly across all available disk drives to prevent hot spots and maximize performance Inherent large file supports Performs automatic online redistribution after the incremental addition or removal of storage capacity Maintains redundant copies of data to provide high availability or leverage 3rd party RAID functionality Supports Oracle Database as well as Oracle Real Application Clusters (RAC)
6 Patterns BENEFITS OF ASM (2 of 2) For simplicity and easier migration to ASM, an Oracle Database can contain ASM and non-ASM files. Any new files can be created as ASM files whilst existing files can also be migrated to ASM RMAN commands enable non-ASM managed files to be relocated to an ASM disk group Oracle Enterprise Manager can be used to manage ASM disk and file management activities ASM reduces Oracle Database cost and complexity without compromising performance or availability
7 Patterns ARCHITECTURE OF ASM OPERATING SYSTEM HARDWARE Oracle Database ASM File System & Volume Management OPERATING SYSTEM HARDWARE Logical Volume Manager File System ORACLE DATABASE
8 Patterns Oracle RAC 10gR2 CONFIGURATION
9 Patterns Oracle RAC 11gR2 CONFIGURATION
Patterns 10 CAPABILITIES OF ASM 1-1 ASM to SERVER Disk1 Disk 2 Disk 3 Disk 4 Disk 5 Disk 6 Disk 7 Disk Group A Disk Group B Database Database Database File 1 File 2 File 3 File 4 ASM Cluster Pool of Storage Oracle RAC Servers ASM Instance ASM Instance ASM Instance ASM Instance ASM Instance Database Instance Database Instance Database Instance Database Instance Database Instance SHARED DISK GROUPS WIDE FILE STRIPING
11 Patterns AUTOMATIC STORAGE MANAGEMENT (ASM) OVERVIEW Current State  ASM Cluster Pool of Storage Disk Group B Disk Group A SHARED DISK GROUPS WIDE FILE STRIPING ONE TO ONE MAPPING OF ASM INSTANCES TO SERVERS ASM Instance Database Instance ASM Disk RAC CLUSTER Node4 Node3 Node2 Node1 Node5 ASM ASM ASM ASM ASM ASM Instance DBA DBA DBB DBB DBC DBB
12 Patterns Oracle RAC 11gR2 CONFIGURATION Current Challenge – Oracle RAC 11gR2  4 Node WAN TRAFFIC CLIENTS Primary Site +ASM1 +ASM2 +ASM3 +ASM4 Loss of Service If ASM on any node fails Database service is down
13 Patterns Oracle Database 11gR2 with ASM login as: oracle oracle@192.168.xx.xx’s password: ******** Last login: Fri Sep 27 06:05:44 2013 [oracle@rac1 ~]$ ps -ef | grep pmon oracle 3053 1 0 05:56 ? 00:00:00 asm_pmon_+ASM1 oracle 3849 1 0 05:57 ? 00:00:00 ora_pmon_flavia1 [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2,rac1 [oracle@rac1 ~]$ crsctl check cluster CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f LOG INTO RAC DATABASE INSTANCE (RAC1) CHECK STATUS OF ASM & RAC DATABASE INSTANCES CHECK STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCES1 (RAC1) CHECK STATUS OF CLUSTER IN RAC DATABASE INSTANCES1 (RAC1) STOP THE ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1)
14 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm CHECK THE STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1)
15 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2
16 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2 [oracle@rac1 ~]$ ps -ef | grep pmon CHECK THE STATUS OF ASM & RAC DATABASE INSTANCE (RAC1)
17 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2 [oracle@rac1 ~]$ ps -ef | grep pmon oracle 7885 5795 0 06:20 pts/0 00:00:00 grep pmon SUMMARY The database instance is strongly linked to the ASM instance If an ASM instance fails so will the database instance on the same node
18 Patterns FLEX ASM: ELIMINATE 1:1 SERVER MAPPING  New: ASM Storage Consolidation in Oracle Database 12c  ASM Cluster Pool of Storage Disk Group B Disk Group A SHARED DISK GROUPS WIDE FILE STRIPING DATABASES SHARE ASM INSTANCES ASM Instance Database Instance ASM Disk RAC Cluster Node5 Node4 Node3 Node2 Node1 Node5 runs as ASM Client to Node4 Node1 runs as ASM Client to Node2 Node4 Node2 runs as ASM Client to Node3 ASM ASM ASM ASM Instance DBA DBA DBB DBB DBC DBB
19 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ hostname [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon oracle 3325 1 0 17:39 ? 00:00:00 asm_pmon_+ASM1 oracle 3813 1 0 17:40 ? 00:00:00 mdb_pmon_-MGMTDB oracle 5806 1 0 17:42 ? 00:00:00 ora_pmon_orcl1 oracle 6193 1 0 17:42 ? 00:00:00 apx_pmon_+APX1 [oracle@oel6-112-rac1 Desktop]$ srvctl status asm ASM is running on oel6-112-rac2,oel6-112-rac1 oel6-112-rac1.localdomain [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode LOG INTO RAC DATABASE INSTANCE 1 (RAC1) CHECK THE STATUS OF ASM & RAC DATABASE INSTANCES CHECK THE STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE FROM INSTANCE 1 (RAC 1) CHECK THE STATUS OF CLUSTER IN INSTANCE 1 (RAC 1) CHECK IF ORACLE FLEX ASM IS ENABLED OR NOT (RAC1)
20 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate
21 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail CHANGE CARDINALITY OF THE ASM (RAC 1)
22 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail
23 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$ asmcmd CHECK IF ORACLE FLEX ASM IS ENABLED OR NOT (RAC2)
24 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate
25 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit
26 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail CHANGE CARDINALITY OF THE ASM (RAC 2)
27 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$
28 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster BRING DOWN THE ASM INSTANCE IN RAC DATABASE INSTANCE 1 (RAC 1) CHECK STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1) CHECK STATUS OF CLUSTER SERVICES IN RAC DATABASE INSTANCE1 (RAC1)
29 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online
30 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon CHECK STATUS OF ASM & RAC DATABASE IN INSTANCE1 (RAC 1)
31 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon oracle 3813 1 0 17:40 ? 00:00:00 mdb_pmon_-MGMTDB oracle 5806 1 0 17:42 ? 00:00:00 ora_pmon_orcl1 oracle 6193 1 0 17:42 ? 00:00:00 apx_pmon_+APX1 NOTE Here a database instance is associated with the specific ASM instance running in the specific node. If in case due to some reason if the ASM instance was unable to be brought up/services goes down, still the database instance can be brought up as the database instance will look for ASM instance running in the same cluster. [oracle@oel6-112-rac1 Desktop]$
32 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac2 Desktop]$ . oraenv ORACLE_SID = [orcl1] ? orcl1 ORACLE_HOME = [/home/oracle] ? /u01/app/oracle/product/12.1.0/db_1 The Oracle base remains unchanged with value /u01/app/oracle CHECK STATUS OF RAC DATABASE INSTANCE RUNNING WITHOUT ASM INTANCE IN RAC DATABASE INSTANCE1 (RAC1)
33 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ sqlplus /nolog SQL*Plus: Release 12.1.0.1.0 Production on Wed Sep 25 18:24:36 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. SQL> connect sys/oracle@orcl as sysdba Connected. SQL> select instance_name, instance_number from gv$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl2 2 orcl1 1 SQL> select instance_name, instance_number from v$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl2 2 SQL> connect sys/oracle@orcl as sysdba Connected. SQL> LOG INTO DATABASE INSTANCE FROM RAC DATABASE INSTANCE (RAC1)
34 Patterns Oracle Database 12cR1 with FLEX ASM SQL> select instance_name, instance_number from gv$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl1 1 [oracle@oel6-112-rac1 Desktop]$ . oraenv ORACLE_SID = [orcl1] ? +ASM2 ORACLE_HOME = [/home/oracle] ? /u01/app/12.1.0/grid The Oracle base remains unchanged with value /u01/app/oracle [oracle@oel6-112-rac1 Desktop]$ asmcmd --privilege sysasm --inst +ASM2 CONNECTING TO ASM INSTANCE OF RAC DATABASE INSTANCE2 (RAC2) FROM RAC DATABASE INSTANCE1 (RAC1)
35 Patterns Oracle Database 12cR1 with FLEX ASM ASMCMD> lsdg State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name MOUNTED EXTERN N 512 4096 1048576 15342 4782 0 4782 0 Y DATA/ ASMCMD> SUMMARY The database instance was using a dedicated ASM instance and that ASM instance was forced to stop working simulating a failure, so the database instance reconnected to an existent ASM instance on another node, for this example node 2 (rac2).
36 Patterns SHARED DISK GROUPS WIDE FILE STRIPING DATABASES SHARE ASM INSTANCES FLEX ASM: SUPPORTING ORACLE DATABASE 11g ASM Cluster Pool of Storage Disk Group B Disk Group A ASM Instance Database Instance ASM Disk RAC CLUSTER Node5 Node4 Node3 Node2 Node1 ASM ASM ASM DBA DBA DBB DBB DBC DBB ASM ASM 11.2 DB 11.2 DB  Previous Database versions will host Local ASM Instance 
37 Patterns Oracle FLEX CLUSTER Comprises of a Hub and Leaf architecture where in only the Hub nodes will only have direct access to Oracle Cluster Registry (OCR) and Voting Disk (VD) However application can access the database via Leaf nodes without ASM instance NOT running on Leaf nodes The connection to the database is through Hub making it transparent for the application Depicts a typical Oracle flex cluster with four Leaf nodes and two Hub nodes. In a nutshell Oracle Flex Cluster requires Oracle Flex ASM.
38 Patterns HUB NODES & LEAF NODES Hub Nodes They are connected among them via private network and have direct access to the shared storage just like previous versions. These nodes are the ones that access the Oracle Cluster Registry (OCR) and Voting Disk (VD) directly. Leaf Nodes These nodes are lighter and are not connected among them, neither access the shared storage like the Hub Nodes. Each Leaf Node communicates with the Hub Node that is attached to, and its connected to the cluster via the Hub Node that is linked to.
39 Patterns Oracle RAC 11gR2 CONFIGURATION
40 Patterns Oracle 12c CONFIGURATION
41 Patterns FLEX ASM & FLEX CLUSTER Flex ASM Higher Availability (DB instances can use remote ASM instances) •Planned or Unplanned downtime Reduces per-node ASM instance overhead •ASM only needs to run on 3 nodes in the cluster Facilitates DB, Cluster & server consolidation Multiple DB’s & applications in a cluster Flex CLUSTER Less complex configuration and management for non-database nodes Less complex configuration for Non-Database nodes, such as Processing Nodes, Application / Web Server Nodes etc. Node evictions NO LONGER REQUIRES a reboot - just a Clusterware restart Cluster Health Monitor Improvements CHM repository now resides in an Oracle DB known as the Grid Infrastructure Management Repository Integrates with OEM for better management
42 Patterns PREVIOUS ASM CLUSTER  ASM architecture utilized an ASM instance on every server Database instances dependent on node-specific ASM instance ASM overhead scaled with size of cluster Cluster reconfiguration events increased with number of servers in a cluster DB1DB2DB3ASMDB1DB2DB4ASMDB1DB5DB4ASMDB1DB5DB6ASMServerServerServerServerCluster
43 Patterns NEW ASM CLUSTER Eliminates requirement for an ASM instance on every cluster server  Database instances connects to any ASM instance in the cluster  Database instances can failover to a secondary ASM instance  Administrators specify the cardinality of ASM instances (default is 3)  Clusterware ensures ASM cardinality is maintained ASMServerServerServerServerASMServerServerServerServerASMServerServerServerServerCluster
44 Patterns FLEX ASM NETWORK In previous versions a CSS cluster requires: A public network for client application access One or more private networks for inter-node communication within the cluster including ASM traffic Flex ASM adds the ASM network, which is used for communication between ASM and its clients Can continue to share the CSS private network
45 Patterns FLEX ASM REMOTE ACCESS Remote Access •In previous versions - ASM Clients use OS-authentication to connect to ASM •This works because ASM Clients and Servers are always on the same server With Oracle Database 12c: ASM Clients and ASM Servers can be on different servers A default configuration is created when the ASM cluster is configured Benefits of providing a shared password file in ASM Disk Group
46 Patterns DEPLOYING FLEX ASM Managing Flex ASM Flex ASM requires minimal monitoring and ongoing management Primary objective is that instances are up and running SRVCTL Command for: Checking ASM instance status Setting cardinality Starting – Stopping - and - Relocating ASM instances No Flex ASM-specific instance parameters are required Default settings will effectively support most situations ASM server instances use automatic memory management Oracle Flex ASM is managed by ASMCA, CRSCTL, SQL*Plus and SRVCTL
47 Patterns NEW FLEX ASM Flex Features Increase maximum number of Disk Groups to 511 (Previous limit was 63) Command for renaming ASM Disk ASM Relocate Command Clients are automatically relocated to another instance if an Oracle ASM instance fails When necessary, Clients can be manually relocated using the ALTER SYSTEM RELOCATE CLIENT command
48 Patterns New Option in Grid Infrastructure Oracle ASM Deployment Model can be chosen during the installation of Oracle Grid Infrastructure Oracle ASM Configuration Assistant (ASMCA) can be used to enable Oracle Flex ASM after the installation / upgrade is performed The functionality is available only in an Oracle Grid Infrastructure Configuration
49 Patterns Conversion of Standard Cluster to Oracle Flex ASM Cluster
50 Patterns
51 Patterns CHECK CLUSTER MODE AND CLUSTER STATE AFTER LOGGING INTO ASMCMD PROMPT [oracle@racnroll1 ~]$ asmcmd ASMCMD> showversion ASM version : 12.1.0.1.0 ASMCMD> showclusterstate Normal ASMCMD> showclustermode ASM cluster : Flex mode enabled
52 Patterns Q&A Session http://docs.oracle.com/ http://www.oracle.com/technetwork/es/articles/index.html Refer for additional information yenugulavenkata.ravikumar ravikumar.yv@patterns-sdi.com @yvrk1973 http://yvrk1973.blogspot.in http://in.linkedin.com/pub/yv-ravikumar-oracle-certified-master-ocm/14/13/a50 Thanks for your time!

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Oracle12c flex asm_flexcluster - Y V RAVI KUMAR

  • 1. 1 Patterns Oracle 12c Flex ASM & Flex Cluster PRESENTER Yenugula Venkata Ravikumar OCM, Head-Database Practice, Patterns 23rd AUGUST 2014 HYDERABAD, INDIA
  • 3. 3 Patterns AGENDA The History of ASM Benefits Of ASM Automatic Storage Management (ASM) Overview Flex ASM Flex Cluster Oracle 10g R2 Functionality Oracle 11g R2 Functionality Oracle 12c R1 Functionality ASM Cluster ASM Network ASM Remote Access Deploying the Flex ASM
  • 4. 4 Patterns HISTORY OF ASM Before Oracle 10g, Storage Management was provided by 3rd parties CUSTOMER CHALLENGES •Large databases required considerable storage management •Best performance required raw storage •NFS solutions, while simple, did not perform as well as raw •For RAC, cluster file systems were not available With Oracle 10g, ASM provided •Simplicity of management, even better than NFS solutions •Performance equal to raw disks •Support for RAC clusters THE SIMPLE IDEA OF ASM •Integrated volume manager and file system •Stripe and mirror files across disks in a ASM Disk Group •Automatic “Rebalance” •Built on the Oracle instance architecture •Manage storage as a global cluster “Shared Disk Groups”
  • 5. 5 Patterns BENEFITS OF ASM (1 of 2) I/O is spread evenly across all available disk drives to prevent hot spots and maximize performance Inherent large file supports Performs automatic online redistribution after the incremental addition or removal of storage capacity Maintains redundant copies of data to provide high availability or leverage 3rd party RAID functionality Supports Oracle Database as well as Oracle Real Application Clusters (RAC)
  • 6. 6 Patterns BENEFITS OF ASM (2 of 2) For simplicity and easier migration to ASM, an Oracle Database can contain ASM and non-ASM files. Any new files can be created as ASM files whilst existing files can also be migrated to ASM RMAN commands enable non-ASM managed files to be relocated to an ASM disk group Oracle Enterprise Manager can be used to manage ASM disk and file management activities ASM reduces Oracle Database cost and complexity without compromising performance or availability
  • 7. 7 Patterns ARCHITECTURE OF ASM OPERATING SYSTEM HARDWARE Oracle Database ASM File System & Volume Management OPERATING SYSTEM HARDWARE Logical Volume Manager File System ORACLE DATABASE
  • 8. 8 Patterns Oracle RAC 10gR2 CONFIGURATION
  • 9. 9 Patterns Oracle RAC 11gR2 CONFIGURATION
  • 10. Patterns 10 CAPABILITIES OF ASM 1-1 ASM to SERVER Disk1 Disk 2 Disk 3 Disk 4 Disk 5 Disk 6 Disk 7 Disk Group A Disk Group B Database Database Database File 1 File 2 File 3 File 4 ASM Cluster Pool of Storage Oracle RAC Servers ASM Instance ASM Instance ASM Instance ASM Instance ASM Instance Database Instance Database Instance Database Instance Database Instance Database Instance SHARED DISK GROUPS WIDE FILE STRIPING
  • 11. 11 Patterns AUTOMATIC STORAGE MANAGEMENT (ASM) OVERVIEW Current State  ASM Cluster Pool of Storage Disk Group B Disk Group A SHARED DISK GROUPS WIDE FILE STRIPING ONE TO ONE MAPPING OF ASM INSTANCES TO SERVERS ASM Instance Database Instance ASM Disk RAC CLUSTER Node4 Node3 Node2 Node1 Node5 ASM ASM ASM ASM ASM ASM Instance DBA DBA DBB DBB DBC DBB
  • 12. 12 Patterns Oracle RAC 11gR2 CONFIGURATION Current Challenge – Oracle RAC 11gR2  4 Node WAN TRAFFIC CLIENTS Primary Site +ASM1 +ASM2 +ASM3 +ASM4 Loss of Service If ASM on any node fails Database service is down
  • 13. 13 Patterns Oracle Database 11gR2 with ASM login as: oracle oracle@192.168.xx.xx’s password: ******** Last login: Fri Sep 27 06:05:44 2013 [oracle@rac1 ~]$ ps -ef | grep pmon oracle 3053 1 0 05:56 ? 00:00:00 asm_pmon_+ASM1 oracle 3849 1 0 05:57 ? 00:00:00 ora_pmon_flavia1 [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2,rac1 [oracle@rac1 ~]$ crsctl check cluster CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f LOG INTO RAC DATABASE INSTANCE (RAC1) CHECK STATUS OF ASM & RAC DATABASE INSTANCES CHECK STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCES1 (RAC1) CHECK STATUS OF CLUSTER IN RAC DATABASE INSTANCES1 (RAC1) STOP THE ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1)
  • 14. 14 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm CHECK THE STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1)
  • 15. 15 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2
  • 16. 16 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2 [oracle@rac1 ~]$ ps -ef | grep pmon CHECK THE STATUS OF ASM & RAC DATABASE INSTANCE (RAC1)
  • 17. 17 Patterns Oracle Database 11gR2 with ASM [oracle@rac1 ~]$ srvctl stop asm -n rac1 -o abort -f [oracle@rac1 ~]$ srvctl status asm ASM is running on rac2 [oracle@rac1 ~]$ ps -ef | grep pmon oracle 7885 5795 0 06:20 pts/0 00:00:00 grep pmon SUMMARY The database instance is strongly linked to the ASM instance If an ASM instance fails so will the database instance on the same node
  • 18. 18 Patterns FLEX ASM: ELIMINATE 1:1 SERVER MAPPING  New: ASM Storage Consolidation in Oracle Database 12c  ASM Cluster Pool of Storage Disk Group B Disk Group A SHARED DISK GROUPS WIDE FILE STRIPING DATABASES SHARE ASM INSTANCES ASM Instance Database Instance ASM Disk RAC Cluster Node5 Node4 Node3 Node2 Node1 Node5 runs as ASM Client to Node4 Node1 runs as ASM Client to Node2 Node4 Node2 runs as ASM Client to Node3 ASM ASM ASM ASM Instance DBA DBA DBB DBB DBC DBB
  • 19. 19 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ hostname [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon oracle 3325 1 0 17:39 ? 00:00:00 asm_pmon_+ASM1 oracle 3813 1 0 17:40 ? 00:00:00 mdb_pmon_-MGMTDB oracle 5806 1 0 17:42 ? 00:00:00 ora_pmon_orcl1 oracle 6193 1 0 17:42 ? 00:00:00 apx_pmon_+APX1 [oracle@oel6-112-rac1 Desktop]$ srvctl status asm ASM is running on oel6-112-rac2,oel6-112-rac1 oel6-112-rac1.localdomain [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode LOG INTO RAC DATABASE INSTANCE 1 (RAC1) CHECK THE STATUS OF ASM & RAC DATABASE INSTANCES CHECK THE STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE FROM INSTANCE 1 (RAC 1) CHECK THE STATUS OF CLUSTER IN INSTANCE 1 (RAC 1) CHECK IF ORACLE FLEX ASM IS ENABLED OR NOT (RAC1)
  • 20. 20 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate
  • 21. 21 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail CHANGE CARDINALITY OF THE ASM (RAC 1)
  • 22. 22 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail
  • 23. 23 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$ asmcmd CHECK IF ORACLE FLEX ASM IS ENABLED OR NOT (RAC2)
  • 24. 24 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate Normal ASMCMD> exit [oracle@oel6-112-rac1 Desktop]$ srvctl status asm -detail ASM is running on oel6-112-rac2,oel6-112-rac1 ASM is enabled. [oracle@oel6-112-rac1 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$ asmcmd ASMCMD> showclustermode ASM cluster : Flex mode enabled ASMCMD> showclusterstate
  • 25. 25 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit
  • 26. 26 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail CHANGE CARDINALITY OF THE ASM (RAC 2)
  • 27. 27 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac2 Desktop]$
  • 28. 28 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster BRING DOWN THE ASM INSTANCE IN RAC DATABASE INSTANCE 1 (RAC 1) CHECK STATUS OF ASM INSTANCE IN RAC DATABASE INSTANCE1 (RAC1) CHECK STATUS OF CLUSTER SERVICES IN RAC DATABASE INSTANCE1 (RAC1)
  • 29. 29 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online
  • 30. 30 Patterns Oracle Database 12cR1 with FLEX ASM Normal ASMCMD> exit [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon CHECK STATUS OF ASM & RAC DATABASE IN INSTANCE1 (RAC 1)
  • 31. 31 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac2 Desktop]$ srvctl config asm -detail ASM home: /u01/app/12.1.0/grid Password file: +DATA/orapwASM ASM listener: LISTENER ASM is enabled. ASM instance count: 3 Cluster ASM listener: ASMNET1LSNR_ASM [oracle@oel6-112-rac1 Desktop]$ srvctl stop asm -node oel6-112-rac1 -stopoption abort -force [oracle@oel6-112-rac1 Desktop]$ srvctl status asm PRCR-1070 : Failed to check if resource ora.asm is registered Cannot communicate with crsd [oracle@oel6-112-rac1 Desktop]$ crsctl check cluster CRS-4535: Cannot communicate with Cluster Ready Services CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online [oracle@oel6-112-rac1 Desktop]$ ps -ef | grep pmon oracle 3813 1 0 17:40 ? 00:00:00 mdb_pmon_-MGMTDB oracle 5806 1 0 17:42 ? 00:00:00 ora_pmon_orcl1 oracle 6193 1 0 17:42 ? 00:00:00 apx_pmon_+APX1 NOTE Here a database instance is associated with the specific ASM instance running in the specific node. If in case due to some reason if the ASM instance was unable to be brought up/services goes down, still the database instance can be brought up as the database instance will look for ASM instance running in the same cluster. [oracle@oel6-112-rac1 Desktop]$
  • 32. 32 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac2 Desktop]$ . oraenv ORACLE_SID = [orcl1] ? orcl1 ORACLE_HOME = [/home/oracle] ? /u01/app/oracle/product/12.1.0/db_1 The Oracle base remains unchanged with value /u01/app/oracle CHECK STATUS OF RAC DATABASE INSTANCE RUNNING WITHOUT ASM INTANCE IN RAC DATABASE INSTANCE1 (RAC1)
  • 33. 33 Patterns Oracle Database 12cR1 with FLEX ASM [oracle@oel6-112-rac1 Desktop]$ sqlplus /nolog SQL*Plus: Release 12.1.0.1.0 Production on Wed Sep 25 18:24:36 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. SQL> connect sys/oracle@orcl as sysdba Connected. SQL> select instance_name, instance_number from gv$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl2 2 orcl1 1 SQL> select instance_name, instance_number from v$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl2 2 SQL> connect sys/oracle@orcl as sysdba Connected. SQL> LOG INTO DATABASE INSTANCE FROM RAC DATABASE INSTANCE (RAC1)
  • 34. 34 Patterns Oracle Database 12cR1 with FLEX ASM SQL> select instance_name, instance_number from gv$instance; INSTANCE_NAME INSTANCE_NUMBER ------------------------------------------- orcl1 1 [oracle@oel6-112-rac1 Desktop]$ . oraenv ORACLE_SID = [orcl1] ? +ASM2 ORACLE_HOME = [/home/oracle] ? /u01/app/12.1.0/grid The Oracle base remains unchanged with value /u01/app/oracle [oracle@oel6-112-rac1 Desktop]$ asmcmd --privilege sysasm --inst +ASM2 CONNECTING TO ASM INSTANCE OF RAC DATABASE INSTANCE2 (RAC2) FROM RAC DATABASE INSTANCE1 (RAC1)
  • 35. 35 Patterns Oracle Database 12cR1 with FLEX ASM ASMCMD> lsdg State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name MOUNTED EXTERN N 512 4096 1048576 15342 4782 0 4782 0 Y DATA/ ASMCMD> SUMMARY The database instance was using a dedicated ASM instance and that ASM instance was forced to stop working simulating a failure, so the database instance reconnected to an existent ASM instance on another node, for this example node 2 (rac2).
  • 36. 36 Patterns SHARED DISK GROUPS WIDE FILE STRIPING DATABASES SHARE ASM INSTANCES FLEX ASM: SUPPORTING ORACLE DATABASE 11g ASM Cluster Pool of Storage Disk Group B Disk Group A ASM Instance Database Instance ASM Disk RAC CLUSTER Node5 Node4 Node3 Node2 Node1 ASM ASM ASM DBA DBA DBB DBB DBC DBB ASM ASM 11.2 DB 11.2 DB  Previous Database versions will host Local ASM Instance 
  • 37. 37 Patterns Oracle FLEX CLUSTER Comprises of a Hub and Leaf architecture where in only the Hub nodes will only have direct access to Oracle Cluster Registry (OCR) and Voting Disk (VD) However application can access the database via Leaf nodes without ASM instance NOT running on Leaf nodes The connection to the database is through Hub making it transparent for the application Depicts a typical Oracle flex cluster with four Leaf nodes and two Hub nodes. In a nutshell Oracle Flex Cluster requires Oracle Flex ASM.
  • 38. 38 Patterns HUB NODES & LEAF NODES Hub Nodes They are connected among them via private network and have direct access to the shared storage just like previous versions. These nodes are the ones that access the Oracle Cluster Registry (OCR) and Voting Disk (VD) directly. Leaf Nodes These nodes are lighter and are not connected among them, neither access the shared storage like the Hub Nodes. Each Leaf Node communicates with the Hub Node that is attached to, and its connected to the cluster via the Hub Node that is linked to.
  • 39. 39 Patterns Oracle RAC 11gR2 CONFIGURATION
  • 40. 40 Patterns Oracle 12c CONFIGURATION
  • 41. 41 Patterns FLEX ASM & FLEX CLUSTER Flex ASM Higher Availability (DB instances can use remote ASM instances) •Planned or Unplanned downtime Reduces per-node ASM instance overhead •ASM only needs to run on 3 nodes in the cluster Facilitates DB, Cluster & server consolidation Multiple DB’s & applications in a cluster Flex CLUSTER Less complex configuration and management for non-database nodes Less complex configuration for Non-Database nodes, such as Processing Nodes, Application / Web Server Nodes etc. Node evictions NO LONGER REQUIRES a reboot - just a Clusterware restart Cluster Health Monitor Improvements CHM repository now resides in an Oracle DB known as the Grid Infrastructure Management Repository Integrates with OEM for better management
  • 42. 42 Patterns PREVIOUS ASM CLUSTER  ASM architecture utilized an ASM instance on every server Database instances dependent on node-specific ASM instance ASM overhead scaled with size of cluster Cluster reconfiguration events increased with number of servers in a cluster DB1DB2DB3ASMDB1DB2DB4ASMDB1DB5DB4ASMDB1DB5DB6ASMServerServerServerServerCluster
  • 43. 43 Patterns NEW ASM CLUSTER Eliminates requirement for an ASM instance on every cluster server  Database instances connects to any ASM instance in the cluster  Database instances can failover to a secondary ASM instance  Administrators specify the cardinality of ASM instances (default is 3)  Clusterware ensures ASM cardinality is maintained ASMServerServerServerServerASMServerServerServerServerASMServerServerServerServerCluster
  • 44. 44 Patterns FLEX ASM NETWORK In previous versions a CSS cluster requires: A public network for client application access One or more private networks for inter-node communication within the cluster including ASM traffic Flex ASM adds the ASM network, which is used for communication between ASM and its clients Can continue to share the CSS private network
  • 45. 45 Patterns FLEX ASM REMOTE ACCESS Remote Access •In previous versions - ASM Clients use OS-authentication to connect to ASM •This works because ASM Clients and Servers are always on the same server With Oracle Database 12c: ASM Clients and ASM Servers can be on different servers A default configuration is created when the ASM cluster is configured Benefits of providing a shared password file in ASM Disk Group
  • 46. 46 Patterns DEPLOYING FLEX ASM Managing Flex ASM Flex ASM requires minimal monitoring and ongoing management Primary objective is that instances are up and running SRVCTL Command for: Checking ASM instance status Setting cardinality Starting – Stopping - and - Relocating ASM instances No Flex ASM-specific instance parameters are required Default settings will effectively support most situations ASM server instances use automatic memory management Oracle Flex ASM is managed by ASMCA, CRSCTL, SQL*Plus and SRVCTL
  • 47. 47 Patterns NEW FLEX ASM Flex Features Increase maximum number of Disk Groups to 511 (Previous limit was 63) Command for renaming ASM Disk ASM Relocate Command Clients are automatically relocated to another instance if an Oracle ASM instance fails When necessary, Clients can be manually relocated using the ALTER SYSTEM RELOCATE CLIENT command
  • 48. 48 Patterns New Option in Grid Infrastructure Oracle ASM Deployment Model can be chosen during the installation of Oracle Grid Infrastructure Oracle ASM Configuration Assistant (ASMCA) can be used to enable Oracle Flex ASM after the installation / upgrade is performed The functionality is available only in an Oracle Grid Infrastructure Configuration
  • 49. 49 Patterns Conversion of Standard Cluster to Oracle Flex ASM Cluster
  • 51. 51 Patterns CHECK CLUSTER MODE AND CLUSTER STATE AFTER LOGGING INTO ASMCMD PROMPT [oracle@racnroll1 ~]$ asmcmd ASMCMD> showversion ASM version : 12.1.0.1.0 ASMCMD> showclusterstate Normal ASMCMD> showclustermode ASM cluster : Flex mode enabled
  • 52. 52 Patterns Q&A Session http://docs.oracle.com/ http://www.oracle.com/technetwork/es/articles/index.html Refer for additional information yenugulavenkata.ravikumar ravikumar.yv@patterns-sdi.com @yvrk1973 http://yvrk1973.blogspot.in http://in.linkedin.com/pub/yv-ravikumar-oracle-certified-master-ocm/14/13/a50 Thanks for your time!