Storage virtualisation loughtec

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Storage virtualisation loughtec

  1. 1. Storage Virtualization Software Technical Feature Descriptions1
  2. 2. Infrastructure-Wide Functions • Across unlike & incompatible devices • Without slowdowns or downtime Auto-Tiering
  3. 3. Intuitive, Self-Guided Workflow3
  4. 4. Virtual Disk PoolingConsolidate like or unlike disk resources ► Split pool into tiers of different price/performance/capacity ► Create and assign virtual disks of desired sizes ► Define access rights ► Explicitly assign virtual disks to hosts or groups of hosts ► Expand capacity without downtime ► Eliminate stranded disk space4
  5. 5. Remove Direct-Attached Drawbacks DAS  Eliminate stranded storage W brand 6TB # P1  Make available capacity accessible to most needy applications Free W brand 8TB # G2  Choose disk characteristics based on program needs  Defer additional purchase X brand until pool nears depletion 11TB # S3 Used5
  6. 6. Manage Capacity as a Pool of Disk Space Tier Cost RAS Speed Density Disk Space (TBs) W brand W brand P1 model P3 model 1 Hi Hi Hi Lo 6TB Used W brand W brand G2 model G5 model 2 Med Hi Med Med 8TB Used SAN X brand Z brand S3 model Q7 model 3 Lo Med Lo Hi 11TB Used6
  7. 7. SAN-wide Centralized ManagementControl / monitor all pooled resources from one console ► Intuitive to set up and operate ► Automates repetitive tasks ► Self-guided wizards for key workflows ► Comprehensive diagnostics & troubleshooting tips ► Configurable views of system behavior and performance ► Role-based, administrative permissions7
  8. 8. Auto-TieringIntelligent trade-offs between cost and performance ► No special disk hardware required ► You select which disks make up each tier ► Adapts to provide most demanding workloads with speediest response8
  9. 9. Traditional: Virtual Disk Assigned to Tier Different pools satisfy different performance/capacity needs Best practice: Dont mix disks of different performance characteristics and/or sizes within one pool Tier 1 Fastest Performance Tier 2 Balanced performance/costs Tier 3 High capacity/Low Cost  ERP  Transactional workloads  Databases  File  Email  User home directory  Archive  Backup-to-disk  Scratch files9
  10. 10. Making Good Decisions on Your Behalf Monitor sustained I/O behavior across groups of disk blocks (chunks) Compare access frequency against average for each tier Promote or demote chunks to most suitable tier Tier 1 Tier 2 Tier 3Chunks Above average Below average moves up a tier moves down a tier11
  11. 11. Virtual Disk distribution within a pool Each Virtual Disk has a Storage Profile assigned Storage Profiles define tier preferences DISK POOL VD Tier 1 Tier 3 VD Storage Profile Storage Profile Tier 2 "High" "Low" VD Storage Profile "Normal"12
  12. 12. Sensing Hot Spots within a Virtual Disk Heaviest hit blocks take advantage of Tier 1 performance Other blocks moved to Tier 2 & Tier 3 DISK POOL Frequently VIRTUAL DISK Accessed Tier 1 Tier 3 Moderately Accessed Infrequently Tier 2 Accessed13
  13. 13. High-Speed CachingSpeeds up performance ► Accelerates disk I/O response from existing storage ► Uses x86-64 CPUs and memory from DataCore nodes as powerful, inexpensive “mega caches” ► Anticipates next blocks to be read, and groups writes to avoid waiting on disks14
  14. 14. Load BalancingImprove response and throughput Improve response and throughput ► Overcome typical storage- related bottlenecks ► Spread load on physical devices using different channels for different virtual disks ► Automatically bypasses failed or offline channels15
  15. 15. Thin ProvisioningAllocate just enough space, just-in-time ► Appears to computers as very large drives (e.g. 2 TB disks) ► Takes up only space actually being written to ► Dynamically allocates more disk space when required ► Reduces need to resize LUNs ► Reclaims zeroed out disk space16
  16. 16. Guessing on Allocation Leads to Waste Disk 1 Disk 2 Disk 3 Free Few Blocks Actually Free Disk 1 Written To Free Disk 3 Free Free Disk 2 Disk 2 Capacity consumed whether used or not!17
  17. 17. Waste-Free Thin Provisioning 2TB Free Virtual + 2.0TB V Disk 3 Allocation: + 2.0TB + 2.0TB0 2TB 6.0TB Free V Disk 2 Actual = 0.4TB0 2TB Free V Disk 10 Physical Disk Pool Time to add more 60% Free Expand as No Device Needed Dependency 0 0.4TB 1TB18
  18. 18. Disk Pool Allocation19
  19. 19. Thin Provisioning Space ReclamationRecover space from deleted files in virtual volumes 2TB Free Space previously V Disk 1 allocated to deleted file0 2TB Free V Disk 1 Fill with zeroes0 Release zero-filled space back to free pool 0 Physical Disk Pool20
  20. 20. RAID StripingBetter protection & performance ► Circumvents drive failures ► Spreads I/O across multiple spindles ► Offloads RAID 0 & 1 ► Supports popular RAID devices in pool21
  21. 21. Synchronous MirroringReal-time I/O replication for High-Availability ► Eliminates storage as a single point of failure ► Enhances survivability using physically separate nodes ► Updates two distributed copies simultaneously ► Mirrored virtual disks behave as one, multi-ported shared drive22
  22. 22. Synchronously Mirrored Writes “Virtual Disk” • Separate Chassis Client • Different Location • Independent Power • Independent Cooling 1 • Separate UPS 4 2 Active Synchronous Partner Mirroring 3 5 Cache Cache 6 Mirror (P) Mirror (S) Node A Node B23
  23. 23. Automatic Failover via Multipath I/O “Virtual Disk” Client Preferred MPIO Alternate 1 1 4 Retry Offline Partner 3 Log Updates 2 Cache Cache Out-of- Mirror (P) Sync Mirror (S) Node A Node B24
  24. 24. Resynchronization of Mirrored Drives “Virtual Disk” Client MPIO Alternate Transmit changes since outage Rejoin Partner Log Updates Cache Cache Out-of- Mirror (P) Sync Mirror (S) Node A Node B25
  25. 25. Resume Normal Operations “Virtual Disk” Client Preferred MPIO Alternate OFF Synchronous Active Mirroring Partner Cache Cache Mirror (P) Mirror (S) Node A Node B26
  26. 26. Track Health of High Availability Mirrors27
  27. 27. Virtual Disk MigrationTransparently move contents from one disk to another ► Allows non-disruptive hardware disk upgrades ► Clears & reclaims space occupied by original ► Provides pass-through access to drives previously used on other systems28
  28. 28. Non-Disruptive Disk Upgrades Virtual disks remain active while contents are migrated to MPIO a different device Physical Storage Pool Old New Tier 1 Tier 2 Retain or discard Tier 3 older device29
  29. 29. Online SnapshotsCapture point-in-time images without tying up much diskspace or make complete clones ► Recover quickly at disk speeds to known good state ► Eliminate back-up window ► Provide “live” environment for analysis, development & testing ► Save snapshots in lower tier, thin-provisioned disks without taking up space on premium storage devices30
  30. 30. Low-impact, Point-in-time Snapshots Copy Empty when original contents Snapshot st write here on 1 enabled Active program If unchanged, read from Source 1 (Earlier point-in-time) 2 E p-i-t Source 3 Current image 4 • Back-up • Testing • Analysis • Recovery Only changed blocks Source disk take up space blocks31
  31. 31. Continuous Data Protection & RecoveryReturn to any point-in-time without taking explicit backups ► Dial back to restore arbitrary point-in-time within a 48 hour time frame ► Logs and timestamps all I/Os to the selected virtual disks ► No need to quiesce or interrupt applications ► No host agents required ► Easy to turn on and revert from32
  32. 32. Revert to Earlier Image Active CDP Time- Stamped Updates Cache Choose time before problem occurred 11:09am = 10:22am 9am 10am 11am33
  33. 33. Remote ReplicationUpdate distant copies without impacting local performance ► Perfect for disaster recovery ► Only needs a basic IP connection to secondary site ► Bi-directional (sites can replicate to each other) ► Asynchronous ► Compressed, multi-stream transfers for fast performance & optimum use of bandwidth34
  34. 34. Keep Remote Disaster RecoverySite Updated DR Site Recovery Destination Image Source Replicated Updates Cache Snapshot Queued Updates Active Cache Central IT site Asynchronous IP Copy35
  35. 35. Advanced Site RecoveryExpedite central site restoration ► Reverses direction of replication from the disaster recovery (DR) site to the primary datacenter ► Same automated process for virtual & physical systems36
  36. 36. THANK YOU !37

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