Oracle RAC + IET

Quite a few people want to use IET with Oracle, here is the information regarding disk caching and reservation from Ozgur from Oracle.

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The SCSI2 and SCSI3 reservation features are not required by Oracle RAC with Oracle clusterware. SCSI3 PR is a requirement of “Veritas” clusterware. So any iSCSI implementation without PR would be ok with Oracle RAC and clusterware. RAC/PCW needs the following:

1. No buffering anywhere in the chain between the Oracle write and the disk subsystem This is provided via raw devices, OCFS or ASM.
2. Persistent naming of devices (by any means): The devices are needed to be named consistently for use of the Oracle clusterware (PCW).

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So as long as you use default write-through mode in IET, disable all write cache in disk drive with hdparm, and use ScsiId or ScsiSN parameter for your LU, you are ready to go!

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