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Asm Rac Extended Cluster On Ibm System P
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  • 1. On Disaster, What next ? Primary Cache Fusion (RAC Interconnect) One Physical Database OCR 1 Voting 1 One Physical Database OCR 2 Voting 2 Site A Primary Site B
    • 3 rd voting to arbitrate …
    • Loosing 1 storage, 1 site will not affect the availability
    • Disks from failed ASM FailureGroup will be off-lined
    Data mirrored by ASM ASM Diskgroup with 2 Failure Group DATA Diskgroup Failure Group Failure Group Primary LPAR LPAR LPAR Apps 1 AIX5L / LoP CRS + RAC AIX5L / LoP Apps 2 AIX5L / LoP Third Site Voting 3
  • 2. On Disaster, What next ? Primary Cache Fusion (RAC Interconnect) One Physical Database OCR 1 Voting 1 One Physical Database OCR 2 Voting 2 Site A Primary Site B LPAR LPAR LPAR Apps 1 AIX5L / LoP CRS + RAC AIX5L / LoP Apps 2 AIX5L / LoP Data mirrored by ASM ASM Diskgroup with 2 Failure Group DATA Diskgroup Failure Group Failure Group Primary Third Site Voting 3
    • Loosing access to 2 voting disks will kill the cluster !!!
  • 3. Recovering from ASM Failure Group loss …
    • On failure, All ASM disks in the failed failure group are OFF-LINED.
    • Disk group will remain on line and database operation will continue uninterrupted with lower redundancy
    Primary One Physical Database OCR 1 Voting 1 One Physical Database OCR 2 Voting 2 Site A Primary Site B Data mirrored by ASM ASM Diskgroup with 2 Failure Group DATA Diskgroup Failure Group Failure Group Primary
  • 4. Recovering from ASM Failure Group loss … Primary One Physical Database OCR 1 Voting 1 One Physical Database OCR 2 Voting 2 Site A Primary Site B Data mirrored by ASM ASM Diskgroup with 2 Failure Group DATA Diskgroup Failure Group Failure Group Primary
    • All ASM disks are automatically dropped after redundancy has been restored.
    • Failed ASM disks (site A) MUST be manually added back in the Failure Group !!!
    • Former Failed ASM failure group will be re-synchronized with data from valid failure group (site B ).
  • 5. New in 11g : ASM Fast Mirror Resync
    • Fraction of time to establish redundancy
    • Only changed blocks are resync’ed
    • Benefits:
      • Fast recovery from transient failures
      • Enables pro-active maintenance
    Disk again accessible: Only need to resync modified extents Failure time < DISK_REPAIR_TIME 2 1
  • 6. New in 11g : ASM Preferred Mirror Read
      • Allow local mirror read operations
      • Eliminate network latencies in extended clusters
        • Better performance
    Site B Site A P S Extended Cluster