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What is RAID (redundant array of independent disks)

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What is RAID (redundant array of independent disks)

  1. 1. What is RAID QsanTechnology.com
  2. 2. What is RAID? RAID (Redundant Array of Independent Disks) A storage technology that combines multiple disks into a single logical unit Divide and replicate data across multiple physical drives
  3. 3. Why use RAID?Advantages data reliability I/O performance capacityDisadvantages Cost!Not meant as a replacement for backups
  4. 4. Hardware vs Software RAID Feature Software RAID Hardware RAIDOn-board XOR No Yesoff-load engine Cost Low High Resources Uses host system Performed by the CPU/memory controller hardwarePerformance Depends on the server High CPU / current loading
  5. 5. Hardware vs Software RAID Feature Software RAID Hardware RAIDOn-board XOR No Yesoff-load engine Cost Low High Resources Uses host system Performed by the CPU/memory controller hardwarePerformance Depends on the server High CPU / current loading Qsan RAID systems provide hardware RAID!!
  6. 6. RAID levels Ways of data distributed across the drives. Each distinct RAID configuration is given a number , called a RAID “level” Redundancy and Performance depends on what RAID level it is.
  7. 7. RAID 0 RAID 0 – Block-level striping and no redundancy (no parity) Best performance but no fault-tolerance. Fault Tolerance 0 disk Space nX
  8. 8. RAID 0 RAID 0 – Block-level striping and no redundancy (no parity) Best performance but no fault-tolerance. Fault Tolerance 0 disk Space nX All Qsan RAID systems support RAID 0
  9. 9. RAID 1 RAID 1 – data mirroring with no parity Best fault-tolerance Fault Tolerance n – 1 disks Space 1X
  10. 10. RAID 1 RAID 1 – data mirroring with no parity Best fault-tolerance Fault Tolerance n – 1 disks Space 1X All Qsan RAID systems support RAID 1
  11. 11. RAID 5 RAID 5 – Block-level striping with distributed (rotating) parity Fault Tolerance 1 disk Space (n-1) X
  12. 12. RAID 5 RAID 5 – Block-level striping with distributed (rotating) parity Fault Tolerance 1 disk Space (n-1) X All Qsan RAID systems support RAID 5
  13. 13. RAID 6 RAID 6 – Block-level striping with double distributed parity Fault Tolerance 2 disk Space (n-2) X
  14. 14. RAID 6 RAID 6 – Block-level striping with double distributed parity Fault 2 disk Tolerance Space (n-2) X All Qsan RAID systems support RAID 6
  15. 15. RAID 0+1 RAID 01 (0+1) – striped disk sets are mirrored Fault Tolerance 2 disk Space The disk number in a single RAID 0 set
  16. 16. RAID 0+1 RAID 01 (0+1) – striped disk sets are mirrored Fault 2 disk Tolerance Space The disk number in a single RAID 0 set All Qsan RAID systems support RAID 0+1
  17. 17. RAID 10 RAID 10 – mirrored sets in a striped set Fault Tolerance 2 disk Space The total RAID 1 set number in the RAID 0 set
  18. 18. RAID 10 RAID 10 – mirrored sets in a striped set Fault 2 disk Tolerance Space The total RAID 1 set number in the RAID 0 set All Qsan RAID systems support RAID 10
  19. 19. RAID 50 RAID 50 – RAID 5 set striped in RAID 0
  20. 20. RAID 50 RAID 50 – RAID 5 set striped in RAID 0 All Qsan high-end RAID systems support RAID 50
  21. 21. Qsan RAID SystemsUnified Storage U600Q, U400Q P600Q, P500Q, P400Q,iSCSI SAN P300Q, P110V04Fiber Channel SAN F600Q, F400Q, F300Q 21
  22. 22. Qsan P SeriesiSCSIPerformance & High Availability at Affordable PriceEnhanced IP SANHigh Availability Value Add-on Dual active RAID controllers  QiSOE (Qsan hardware iSCSI offload engine) Cache mirroring via high bandwidth channels  QThin (thin provisioning) Multi-path & load-balancing  QReplica (remote replication) (MPIO, MC/S, Trunking, LACP)  QSnap (copy-on-write snapshot) Fully redundant & hot pluggable design  BBM (battery backup module) Performance Total Cost of OwnershipFlexible Volume for Multiple Applications Green Storage Design Virtualization: VMware, Citrix, Hyper-V  Auto disk spin down For cloud storage, surveillance, backup &  Advanced cooling mechanismArchive, video streaming, etc  80 PLUS energy-efficient power supplies 22
  23. 23. Qsan F SeriesFibre Channel SANOutstanding Performance, Reliability yet Cost-EffectiveHigh Availability Value Add-on Dual active RAID controllers  QThin (thin provisioning) Cache mirroring via high bandwidth channels  QReplica (remote replication) Multi-path & load-balancing  QSnap (copy-on-write snapshot) (MPIO, MC/S, Trunking, LACP)  BBM (battery backup module) Fully redundant & hot pluggable designFlexible Volume for Multiple Applications Green Storage Design Virtualization: VMware, Citrix, Hyper-V  Auto disk spin down For video editing, video streaming, database,  Advanced cooling mechanismbackup, etc  80 PLUS energy-efficient power supplies Boot-from-SAN 23
  24. 24. Qsan Unified Storage 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 24
  25. 25. JBOD JBOD – Just a Bunch of Disks Each disk works as an independent disk in the array
  26. 26. Qsan JBOD J300Q The Qsan J300Q 6Gb SAS-to-SAS JBOD enclosure supports both SAS and SATA-II drives, providing high availability as well as cost advantages for small and medium business. 26
  27. 27. QsanTechnology.comSales@Qsan.com.tw Thank you very much!

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