Mod-Storage Area Networks design scenarios
- 1. Storage Virtualization Section 2 : Storage Networking Technologies and Virtualization
- 2. Chapter Objectives • Identify different virtualization technologies • Describe block-level virtualization technologies • Describe file-level virtualization technologies • Discuss virtual provisioning
- 3. What is Virtualization • Virtualization is a technique of abstracting physical resources into logical view • Increases utilization and capability of IT resource • Simplifies resource management by pooling and sharing resources • Significantly reduce downtime – Planned and unplanned • Improved performance of IT resources
- 4. What is a Virtual Machine ?
- 5. Virtualization Comes in Many Forms 5 Each application sees its own logical memory, independent of physical memory Virtual Memory Each application sees its own logical network, independent of physical network Virtual Networks Each application sees its own logical server, independent of physical servers Virtual Servers Each application sees its own logical storage, independent of physical storage Virtual Storage
- 6. 6 Each application sees its own logical memory, independent of physical memory Virtual Memory Memory Virtualization Benefits of Virtual Memory •Remove physical-memory limits •Run multiple applications at once Physical memory Swap space App App App
- 7. 7 Each application sees its own logical network, independent of physical network Virtual Networks Network Virtualization Benefits of Virtual Networks •Common network links with access- control properties of separate links •Manage logical networks instead of physical networks •Virtual SANs provide similar benefits for storage-area networks VLAN A VLAN B VLAN C VLAN trunk Switch Switch
- 8. Server Virtualization Before Server Virtualization: Operating system Application Single operating system image per machine Software and hardware tightly coupled Running multiple applications on same machine often creates conflict Underutilized resources After Server Virtualization: Virtual Machines (VMs) break dependencies between operating system and hardware Manage operating system and application as single unit by encapsulating them into VMs Strong fault and security isolation Hardware-independent Virtualization layer Operating system App App App Operating system App App App
- 9. Storage Virtualization • Process of presenting a logical view of physical storage resources to hosts • Logical storage appears and behaves as physical storage directly connected to host • Examples of storage virtualization are: – Host-based volume management – LUN creation – Tape virtualization • Benefits of storage virtualization: – Increased storage utilization – Adding or deleting storage without affecting application’s availability – Non-disruptive data migration Virtualization Layer Heterogeneous Physical Storage Servers
- 10. SNIA Storage Virtualization Taxonomy Storage Virtualization Block Virtualization Disk Virtualization File System, File/record Virtualization Other Device Virtualization Tape, Tape Drive, Tape Library Virtualization Network Based Virtualization Storage Device/Storage Subsystem Virtualization Host Based Virtualization In-band Virtualization Out-of-band Virtualization What is created Where it is done How it is implemented
- 11. Storage Virtualization Requires a Multi-Level Approach Server Storage Network Storage Path management Volume management Replication Volume management - LUNs Access control Replication RAID Path redirection Load balancing - ISL trucking Access control - Zoning
- 13. Storage Virtualization Configuration Out-of-band implementation Virtualized environment configuration is stored external to the data path Virtualization appliance is hardware-based and optimized for fibre channel Enables data to be processed at network speed More scalable In-band implementation Virtualization function is placed in the data path Virtualization appliance is software-based and runs on general-purpose servers During processing, data storing and forwarding through the appliance results in additional latency Less scalable – only suitable for static environment with predictable workloads
- 14. Storage Virtualization Challenges • Scalability – Without virtualization, each storage array is managed independently to meet application requirements in terms of capacity and IOPS – With virtualization, the environment as a whole must be analyzed • Functionality – Virtualized environment must provide same or better functionality – Must continue to leverage existing functionality on arrays • Manageability – Virtualization device breaks end-to-end view of storage infrastructure – Must integrate with existing management tools • Support – Interoperability in multivendor environment
- 15. Block-Level Storage Virtualization • Ties together multiple independent storage arrays – Presented to host as a single storage device – Hosts are directed to virtualized volumes on the virtualization device – Mapping is done to redirect I/O on this virtual storage device to underlying physical arrays • Deployed in a SAN environment • Non-disruptive data mobility and data migration • Enable significant cost and resource optimization Servers Heterogeneous Storage Arrays Virtualization Applied at SAN Level
- 16. File-Level Virtualization Every NAS device is an independent entity, physically and logically Underutilized storage resources Downtime caused by data migrations NAS Devices/Platforms Before File-Level Virtualization IP Network Storage Array File Server File Server Clients Clients Break dependencies between end-user access and data location Storage utilization is optimized Nondisruptive migrations NAS Devices/Platforms After File-Level Virtualization IP Network Clients Clients Storage Array File Server File Server Virtualization Appliance
- 17. Chapter Summary Key points covered in this chapter: • Virtualization technologies and forms • SNIA storage virtualization taxonomy • Storage virtualization configuration • Storage virtualization challenges • Types of storage virtualization
Editor's Notes
- #17: These are the key points covered in this chapter. Please take a moment to review them.