On Disaster, What next ? Primary Cache Fusion (RAC Interconnect) One  Physical Database OCR 1 Voting 1 One  Physical Datab...
On Disaster, What next ? Primary Cache Fusion (RAC Interconnect) One  Physical Database OCR 1 Voting 1 One  Physical Datab...
Recovering from ASM Failure Group loss … <ul><li>On failure, All ASM disks in the failed failure group are OFF-LINED. </li...
Recovering from ASM Failure Group loss … Primary One  Physical Database OCR 1 Voting 1 One  Physical Database OCR 2 Voting...
New in 11g : ASM Fast Mirror Resync <ul><li>Fraction of time to establish redundancy </li></ul><ul><li>Only changed blocks...
New in 11g : ASM Preferred Mirror Read <ul><ul><li>Allow local mirror read operations </li></ul></ul><ul><ul><li>Eliminate...
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Asm Rac Extended Cluster On Ibm System P

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  • Asm Rac Extended Cluster On Ibm System P

    1. 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 <ul><li>3 rd voting to arbitrate … </li></ul><ul><li>Loosing 1 storage, 1 site will not affect the availability </li></ul><ul><li>Disks from failed ASM FailureGroup will be off-lined </li></ul>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. 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 <ul><li>Loosing access to 2 voting disks will kill the cluster !!! </li></ul>
    3. 3. Recovering from ASM Failure Group loss … <ul><li>On failure, All ASM disks in the failed failure group are OFF-LINED. </li></ul><ul><li>Disk group will remain on line and database operation will continue uninterrupted with lower redundancy </li></ul>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. 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 <ul><li>All ASM disks are automatically dropped after redundancy has been restored. </li></ul><ul><li>Failed ASM disks (site A) MUST be manually added back in the Failure Group !!! </li></ul><ul><li>Former Failed ASM failure group will be re-synchronized with data from valid failure group (site B ). </li></ul>
    5. 5. New in 11g : ASM Fast Mirror Resync <ul><li>Fraction of time to establish redundancy </li></ul><ul><li>Only changed blocks are resync’ed </li></ul><ul><li>Benefits: </li></ul><ul><ul><li>Fast recovery from transient failures </li></ul></ul><ul><ul><li>Enables pro-active maintenance </li></ul></ul>Disk again accessible: Only need to resync modified extents Failure time < DISK_REPAIR_TIME 2 1
    6. 6. New in 11g : ASM Preferred Mirror Read <ul><ul><li>Allow local mirror read operations </li></ul></ul><ul><ul><li>Eliminate network latencies in extended clusters </li></ul></ul><ul><ul><ul><li>Better performance </li></ul></ul></ul>Site B Site A P S Extended Cluster

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