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All trademarks and registered trademarks are the property of their respective owners.© HelpSystems LLC. All rights reserved.
with Glenn Robinson and Ash Giddings
High Availability
Options for IBM i
HelpSystems Corporate Overview. All rights reserved.
Ash Giddings
Product Manager
HelpSystems
Today’s Presenters
Glenn Robinson
Power Systems Architect
RSI Consulting
HelpSystems Corporate Overview. All rights reserved.
• What is high availability?
• Current options
• Which method is best?
• Additional resources
• Q&A and recap
Agenda
UP NEXT...
What is high availability?
HelpSystems Corporate Overview. All rights reserved.
What is high availability?
In information technology, high
availability refers to a system or
component that is continuously
operational for a desirably
long length of time.
Availability can be measured
relative to "100% operational" or
"never failing."
24/7
HelpSystems Corporate Overview. All rights reserved.
What is high availability?
UP NEXT...
Current options
HelpSystems Corporate Overview. All rights reserved.
HA/DR options for IBM i
• Logical replication
– Replication at the object level provided by third-party software
• PowerHA geographic mirroring
– Replication by the IBM i operating system
– Block-level replication of an independent ASP (IASP) to another IBM i LPAR
– Internal or external storage
– Requires PowerHA license
• Storage replication
– Replication by the storage system, e.g. V7000
– Block-level replication of an IASP or an entire system
– External storage only
HelpSystems Corporate Overview. All rights reserved.
Logical replication
HelpSystems Corporate Overview. All rights reserved.
• Pros
– Target can be used for read-only access to replicated data
– Journaling is mandatory
– Source and target LPAR are both active
• Cons
– Requires third-party software
– Operating system overhead; depends on how much data is being replicated
– Objects to be replicated need to be defined to the replication software
– Estimates denote around 182 man-hours per year for monitoring
• Comments
– Popular customer choice
– Data replicated over IP only
Logical replication
HelpSystems Corporate Overview. All rights reserved.
PowerHA geographic mirroring
HelpSystems Corporate Overview. All rights reserved.
• Pros
– All data is copied from source to target as this is disk mirroring
– Choice of synchronous and asynchronous replication
– Minimal amount of monitoring required
• Cons
– Requires PowerHA license on each LPAR
– Only an IASP can be mirrored
– Operating system overhead; depends on how much data is being replicated
– The IASP can only be accessed by one LPAR at any one time
– Fairly complicated PowerHA clustering configuration
• Comments
– Replication over IP only
– Journaling not required but is recommended
– Not widely implemented
PowerHA geographic mirroring
HelpSystems Corporate Overview. All rights reserved.
Metro Mirror
Global Mirror
Global Mirror
with Change Volumes
Storage-based mirroring
HelpSystems Corporate Overview. All rights reserved.
Disaster recovery testing without interruption
• Storage replication from site 1 to site
2
• Create a point-in-time FlashCopy of
the volumes at site 2
• Run an LPAR over the J2 volumes
and test DR
• No interruption to storage replication
at any point
• Gone are the days of 4- to 5-day
engagements with your DR hardware
provider!!!
Site 1 Site 2
J 2
H 1 H 2
Flash Copy
Global Copy
HelpSystems Corporate Overview. All rights reserved.
• Pros
– All data is copied from source to target as this is disk mirroring
– No overhead on the operating system; this is completely transparent to IBM i
– Choice of synchronous and asynchronous replication
– Full system and/or IASP replication can be configured
– Simple configuration on storage
– Minimal amount of monitoring required
• Cons
– The target LPAR cannot be active if full system replication is being used
– Remote mirroring license required on most storage systems
– Knowledge of storage subsystem required for initial configuration
• Comments
– Replication over IP or fibre
– Becoming increasingly popular
– Journaling not required but is recommended
Storage-based mirroring
HelpSystems Corporate Overview. All rights reserved.
Logical
replication
Geographic
mirroring
Storage-based
replication
Source and target active at
all times
Y Y* N
Journaling mandatory Y N N
Overhead on IBM i OS Y Y N
All objects replicated N Y Y
PowerHA required N Y N
Target is a clone of the
source
N Y Y
Target can be used for
backups
Y Y** Y***
Requires IASP N Y N
*Only SYSBAS is active on both source and target
** Only if replication is stopped
*** Requires use of FlashCopy snapshots
Summary of options
UP NEXT...
Which option is best for me?
HelpSystems Corporate Overview. All rights reserved.
• Assess each LPAR on a needs basis
• A combination of both logical and storage replication may be the best fit
• There is no right or wrong answer
Which option is best for me?
HelpSystems Corporate Overview. All rights reserved.
• Does my LPAR require 24/7 availability?
– Use logical replication
• Do I require the source and target LPAR active at all times?
– Use logical replication
• Do I want to run my production LPAR backups on another LPAR?
– You can use both logical replication and storage replication
• Do I need simplified replication for my LPAR?
– Use storage-based replication
Questions to ask
HelpSystems Corporate Overview. All rights reserved.
• FlashCopy backups using storage software
• FlashCopy within VIOS shared storage pools
• BRMS integration with FlashCopy
• Clone LPARs in seconds
• Share IASPs without a PowerHA license
Other ideas to consider
HelpSystems Corporate Overview. All rights reserved.
• IBM i Advanced Copy Services
– http://tinyurl.com/o5t4k8b
– Full System Replication for SVC and Storwize
 Provides IBM i commands to configure and manage remote mirroring
– Full System Copy Services Manger
 IBM i commands to create a snapshot of an LPAR and back up to tape
on another LPAR
 Provides the capability to quiesce SYSBAS instead of having to power
down the LPAR
» No interruption to the users
– BRMS integration
 BRMS can be used to backup an LPAR clone but update the BRMS
database on the source LPAR
IBM Lab Services offerings
UP NEXT...
About HelpSystems
HelpSystems Corporate Overview. All rights reserved.
Solutions portfolio
HelpSystems Corporate Overview. All rights reserved.
HelpSystems Corporate Overview. All rights reserved.
Template approach
UP NEXT...
Q&A and recap
HelpSystems Corporate Overview. All rights reserved.
• What is high availability?
• Current options
• Which method is best?
• Additional resources
Q&A and recap
HelpSystems Corporate Overview. All rights reserved.
Contact Us
Website:
www.helpsystems.com/halcyon
Ash Giddings
Product Manager
HelpSystems
ash.giddings@helpsystems.com
Glenn Robinson
Power Systems Architect
RSI Consulting
glenn.robinson@rsipvm.com
Telephone:
800-328-100
+44 (0) 1733 234995

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High Availability Options for IBM i

  • 1. All trademarks and registered trademarks are the property of their respective owners.© HelpSystems LLC. All rights reserved. with Glenn Robinson and Ash Giddings High Availability Options for IBM i
  • 2. HelpSystems Corporate Overview. All rights reserved. Ash Giddings Product Manager HelpSystems Today’s Presenters Glenn Robinson Power Systems Architect RSI Consulting
  • 3. HelpSystems Corporate Overview. All rights reserved. • What is high availability? • Current options • Which method is best? • Additional resources • Q&A and recap Agenda
  • 4. UP NEXT... What is high availability?
  • 5. HelpSystems Corporate Overview. All rights reserved. What is high availability? In information technology, high availability refers to a system or component that is continuously operational for a desirably long length of time. Availability can be measured relative to "100% operational" or "never failing." 24/7
  • 6. HelpSystems Corporate Overview. All rights reserved. What is high availability?
  • 8. HelpSystems Corporate Overview. All rights reserved. HA/DR options for IBM i • Logical replication – Replication at the object level provided by third-party software • PowerHA geographic mirroring – Replication by the IBM i operating system – Block-level replication of an independent ASP (IASP) to another IBM i LPAR – Internal or external storage – Requires PowerHA license • Storage replication – Replication by the storage system, e.g. V7000 – Block-level replication of an IASP or an entire system – External storage only
  • 9. HelpSystems Corporate Overview. All rights reserved. Logical replication
  • 10. HelpSystems Corporate Overview. All rights reserved. • Pros – Target can be used for read-only access to replicated data – Journaling is mandatory – Source and target LPAR are both active • Cons – Requires third-party software – Operating system overhead; depends on how much data is being replicated – Objects to be replicated need to be defined to the replication software – Estimates denote around 182 man-hours per year for monitoring • Comments – Popular customer choice – Data replicated over IP only Logical replication
  • 11. HelpSystems Corporate Overview. All rights reserved. PowerHA geographic mirroring
  • 12. HelpSystems Corporate Overview. All rights reserved. • Pros – All data is copied from source to target as this is disk mirroring – Choice of synchronous and asynchronous replication – Minimal amount of monitoring required • Cons – Requires PowerHA license on each LPAR – Only an IASP can be mirrored – Operating system overhead; depends on how much data is being replicated – The IASP can only be accessed by one LPAR at any one time – Fairly complicated PowerHA clustering configuration • Comments – Replication over IP only – Journaling not required but is recommended – Not widely implemented PowerHA geographic mirroring
  • 13. HelpSystems Corporate Overview. All rights reserved. Metro Mirror Global Mirror Global Mirror with Change Volumes Storage-based mirroring
  • 14. HelpSystems Corporate Overview. All rights reserved. Disaster recovery testing without interruption • Storage replication from site 1 to site 2 • Create a point-in-time FlashCopy of the volumes at site 2 • Run an LPAR over the J2 volumes and test DR • No interruption to storage replication at any point • Gone are the days of 4- to 5-day engagements with your DR hardware provider!!! Site 1 Site 2 J 2 H 1 H 2 Flash Copy Global Copy
  • 15. HelpSystems Corporate Overview. All rights reserved. • Pros – All data is copied from source to target as this is disk mirroring – No overhead on the operating system; this is completely transparent to IBM i – Choice of synchronous and asynchronous replication – Full system and/or IASP replication can be configured – Simple configuration on storage – Minimal amount of monitoring required • Cons – The target LPAR cannot be active if full system replication is being used – Remote mirroring license required on most storage systems – Knowledge of storage subsystem required for initial configuration • Comments – Replication over IP or fibre – Becoming increasingly popular – Journaling not required but is recommended Storage-based mirroring
  • 16. HelpSystems Corporate Overview. All rights reserved. Logical replication Geographic mirroring Storage-based replication Source and target active at all times Y Y* N Journaling mandatory Y N N Overhead on IBM i OS Y Y N All objects replicated N Y Y PowerHA required N Y N Target is a clone of the source N Y Y Target can be used for backups Y Y** Y*** Requires IASP N Y N *Only SYSBAS is active on both source and target ** Only if replication is stopped *** Requires use of FlashCopy snapshots Summary of options
  • 17. UP NEXT... Which option is best for me?
  • 18. HelpSystems Corporate Overview. All rights reserved. • Assess each LPAR on a needs basis • A combination of both logical and storage replication may be the best fit • There is no right or wrong answer Which option is best for me?
  • 19. HelpSystems Corporate Overview. All rights reserved. • Does my LPAR require 24/7 availability? – Use logical replication • Do I require the source and target LPAR active at all times? – Use logical replication • Do I want to run my production LPAR backups on another LPAR? – You can use both logical replication and storage replication • Do I need simplified replication for my LPAR? – Use storage-based replication Questions to ask
  • 20. HelpSystems Corporate Overview. All rights reserved. • FlashCopy backups using storage software • FlashCopy within VIOS shared storage pools • BRMS integration with FlashCopy • Clone LPARs in seconds • Share IASPs without a PowerHA license Other ideas to consider
  • 21. HelpSystems Corporate Overview. All rights reserved. • IBM i Advanced Copy Services – http://tinyurl.com/o5t4k8b – Full System Replication for SVC and Storwize  Provides IBM i commands to configure and manage remote mirroring – Full System Copy Services Manger  IBM i commands to create a snapshot of an LPAR and back up to tape on another LPAR  Provides the capability to quiesce SYSBAS instead of having to power down the LPAR » No interruption to the users – BRMS integration  BRMS can be used to backup an LPAR clone but update the BRMS database on the source LPAR IBM Lab Services offerings
  • 23. HelpSystems Corporate Overview. All rights reserved. Solutions portfolio
  • 24. HelpSystems Corporate Overview. All rights reserved.
  • 25. HelpSystems Corporate Overview. All rights reserved. Template approach
  • 27. HelpSystems Corporate Overview. All rights reserved. • What is high availability? • Current options • Which method is best? • Additional resources Q&A and recap
  • 28. HelpSystems Corporate Overview. All rights reserved. Contact Us Website: www.helpsystems.com/halcyon Ash Giddings Product Manager HelpSystems ash.giddings@helpsystems.com Glenn Robinson Power Systems Architect RSI Consulting glenn.robinson@rsipvm.com Telephone: 800-328-100 +44 (0) 1733 234995

Editor's Notes

  • #5: POLL QUESTION 1
  • #8: POLL QUESTION 1
  • #18: POLL QUESTION 1
  • #24: Our different brands provide a module based solution for attacking individual server operating systems or we can manage the whole network with a combination of products like Intermapper, Skybot, Robot, PowerTech, CCSS, Safestone, etc. Our core strength is IBM i, but so we know what it takes to keep the enterprise running as many critical applications run on this platform for retail, banking, insurance and more industries.
  • #27: POLL QUESTION 1