Oracle Solaris Performance, Panics, Hangs, and Dtrace (MOSC)

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IO Bottleneck

edited May 1, 2015 2:15PM in Oracle Solaris Performance, Panics, Hangs, and Dtrace (MOSC) 3 commentsAnswered ✓

Hi all,

We've got an Oracle database on a Solaris server, with a lot of IO ( between 100 and 320MB/s ), the other databases don't request much IO. They are complaining about some performance issues, event if we don't have a lot of wait or service time. I suggested them that we work on the ZFS parameters first ( DBA changed the block size without telling us... ), but they are still asking about the raw IO performance.

I made a test with a dd from a SAN disk, and indeed I cannot achieve more than these 300MB/s on SAN read IO. HBA can perform 8Gb/s, so we may have a bottleneck here ( even if, imho, there is a lot of work to be done before digging to that level ). So, does anyone have an explanation about this IO limitation ? I was wondering if I should increase the /etc/system parameters :

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