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Write I/O performance slow in RAC on SAN

970981Oct 26 2012 — edited Oct 30 2012

Currently building a new 11.2.0.3 RAC on OL6.

I am using ASM on top of a SAN that is exposing 4x2TB LUNS to the 3 nodes, as the DATA disk group.
The nodes are communicating over 10gb isci to the SAN.

async_io=true
filesystemio_options=setall

When creating a test table space I am only seeing about 3-5 mb/s write throughput from Oracle. When testing with ioZone tool to write 8k block size files on to the drives
I am seeing ~115 mb/s throughput.

I have verified that DBWR is calling io_submit by using strace on the process.

Not sure where to go from here with troubleshooting?

Thanks.

Edited by: mosho88 on Oct 29, 2012 12:43 PM

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Locked on Nov 27 2012

Added on Oct 26 2012

#automatic-storage-management, #performance-availability

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