Disk Rebuild & Spare Disk for Network Storage

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The introduction by Qsan Technology for Disk Rebuild & Spare Disk of Network Storage

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Disk Rebuild & Spare Disk for Network Storage

  1. 1. Disk Rebuild & Spare DisksIn Qsan Network Storage QsanTechnology.com
  2. 2. RAID 0, RAID 1 (Performance) (Data Protection) RAID 0 RAID 1 D Z D C Y C B X B A W A Write AA WW AA AA BB X X B B B B CC YY CC CC DD Z Z D D D D 2X write speed 1X write speed
  3. 3. RAID 0, RAID 1 (Performance) (Data Protection) RAID 0 RAID 1 D Z D C Y C B X B A W A Read AA WW AA AA BB X X B B B B CC YY CC CC DD Z Z D D D D 2X Read Speed 2X Read Speed
  4. 4. RAID 5 RAID 5 (1 Parity Stripe) A Balance of performance and protection DATAD1 C1 B1 A1 D1 C1 B1 A1D2 C2 B2 A2 D2 C2 B2 A2D3 C3 B3 A3 D3 C3 B3 A3 CALC ULAT ES A1 A2 A3 Ap B1 B2 Bp B3 C1 Cp C2 C3 Dp D1 D2 D3 CALCULATES
  5. 5. RAID 5 RAID 5 (1 Parity Stripe) A Balance of performance and protection DATAD1 C1 B1 A1 D1 C1 B1 A1D2 C2 B2 A2 D2 C2 B2 A2D3 C3 B3 A3 D3 C3 B3 A3 A1 A2 A3 Ap B1 B2 Bp B3 B3 C1 Cp C2 C3 Fails Dp D1 D2 D3 CALCULATES
  6. 6. Comparison RAID 0 RAID 1 RAID 5 RAID 6Min. Disk # 2 2 3 4Fault 0 N-1 1 2Tolerance Disk#Space nX 1X (n-1)X (n-2)XN: Disk numbersX: Disk space All Qsan RAID systems support RAID 0, 1, 0+1. 5, 6, 10 6
  7. 7. Degrade Mode When one or more physical disks in a RAID Group failed or missing, if…  Amount of healthy disks left in the RAID Group >= X , where  X = 1 in RAID 1 (N disks)  X = N-1 in RAID 3/5 (N disks)  X = N-2 in RAID 6 (N disks)  The RAID group enters Degraded Mode, waiting for failed disks to be replaced/recovered.  RAID 0 enters failed status directly.  Else, the RAID Group fails, cannot be recovered.
  8. 8. Degrade Mode Test How many failed physical disks at most can you have in a RAID group to keep data availability?  RAID 5 of 3 disks  RAID 0 of 2 disks  RAID 1 of 2 disks  RAID 6 of 4 disks
  9. 9. Degrade Mode Test How many failed physical disks at most can you have in a RAID group to keep data availability?  RAID 5 of 3 disks Answer: 1 disk  RAID 0 of 2 disks Answer: 0 disk  RAID 1 of 2 disks Answer: 1 disk  RAID 6 of 4 disks Answer: 2 disk Do you pass this test?
  10. 10. RAID Group Health Status All disks in good condition Healthy Failed/Missing Disk Amount Within tolerance amount Rebuilding finished Failed/Missing Disks Replaced/Restored Degraded Rebuilding Failed/Missing Disk Amount Failed/Missing Disk Amount (including disks being rebuilt) Exceeds tolerance amount Exceeds tolerance amount Failed
  11. 11. Rebuild Mode While Rebuilding is processing  All VDs (virtual disk) in the same RG(RAID group) are to be rebuilt  VDs are rebuilt in order  DATA can still be accessed  Slower Performance  Frequent I/O while rebuilding affects rebuilding progress
  12. 12. RAID Failure Disks undetected  Removed disks, bad connectors, unpowered disks Failed Disks  Bad disk status reported from the disks  More than 300 I/O retries accumulated in 10 minutes  Replace the faulty disks with healthy ones  Read Error?  Does not necessarily indicate disk failure.  Disks with read errors are more likely to fail.  Rebooting the system clears the Read Error status.
  13. 13. Spare Disks What is a spare disk? Why do we need spare disks? Types of spare disks  Global spare  Dedicated spare Requirements?  What do we need in the system to use this function?
  14. 14. Global Spare (GS) A disk that is assigned to be the spare disk of ANY RG in need. Can be used by ANY degraded RG. RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 GS RG1 RG1 RG2 GS
  15. 15. Global Spare (GS) A disk that is assigned to be the spare disk of ANY RG in need. Can be used by ANY degraded RG. Auto assign RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 GS RG1 RG1 RG2 GS
  16. 16. Global Spare (GS) A disk that is assigned to be the spare disk of ANY RG in need. Can be used by ANY degraded RG. Auto assign RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 GS RG1 RG1 RG2 GS Auto assign
  17. 17. Dedicated Spare (DS) A disk that is assigned to be the spare disk of a Dedicated RG. Used by the dedicated RG ONLY. RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 DS1 RG1 RG1 RG2 DS3
  18. 18. Dedicated Spare (DS) A disk that is assigned to be the spare disk of a Dedicated RG. Used by the dedicated RG ONLY. Auto assign RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 DS1 RG1 RG1 RG2 DS3
  19. 19. Dedicated Spare (DS) A disk that is assigned to be the spare disk of a Dedicated RG. Used by the dedicated RG ONLY. Auto assign RG1 RG1 RG2 RG3 RG1 RG1 RG2 RG3 RG1 RG1 RG2 DS1 RG1 RG1 RG2 DS3 NOT allowed!!
  20. 20. TrioNAS LX U600Q Outstanding Performance  Advanced Protection o Hardware RAID o Snapshot o SSD caching o Volume clone o Qsan Unified OS o Battery Backup Module o AntiVirus Integrated Backup Solution  Storage Efficiency o Amazon S3 Cloud backup o Thin Provisioning, DeDup, Compression o Remote Replication o UnifiedAUTH 20
  21. 21. AegisSAN LX P600Q (iSCSI) 10GbE iSCSI-6G SAS High Availability Systems  Outstanding Performance  Intel Xeon Dual core CPU, Intel® Ethernet  QiSOE (Qsan Hardware iSCSI 10GbE offload engine)  Dual Active controllers, and full redundant  Up to 640K IOPS, up to 4,000 and hot-pluggable design MB/s throughput  2x 10GbE + 2x 1GbE iSCSI ports per controller  SBB form factor, 4U24/3U16/2U12/2U24  Support RAID 0, 1, 0+1, 3, 5, 6, 10, 30, 50, 60, JBOD, N-way mirror, online volume expansion 21
  22. 22. AegisSAN LX F600Q (Fibre Channel) 8GbE FC-6G SAS High Availability Systems  Outstanding Performance  Intel Xeon Dual core CPU  Up to 650K IOPS, up to 5,000  Dual Active controllers, and full redundant and MB/s throughput hot-pluggable design  4x 8G FC + 2x 1GbE iSCSI ports per controller  SBB form factor, 4U24/3U16/2U12/2U24  Support RAID 0, 1, 0+1, 3, 5, 6, 10, 30, 50, 60, JBOD, N-way mirror, online volume expansion 22
  23. 23. QsanTechnology.comSales@QsanTechnology.com Thank you very much!

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