Trying to determine the correct number of XFS allocation groups for postgresql server on Linux

Posted by HBlend on Server Fault See other posts from Server Fault or by HBlend
Published on 2011-01-14T00:51:25Z Indexed on 2011/01/14 0:55 UTC
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Filed under:

postgresql

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linux-server

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xfs

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postgresql-8.4

I am running a postgres 8.4.5 server on the linux 2.6.33.7 kernel on an 8 disk raid array with an LSI controller.

Most of the tables are around 1GB or less.

I know that XFS uses allocation groups (AG) to achieve I/O parallelism.

My first question is, does this mean that if two tables are in the same AG, all I/O requests are queued to both of them if either is being read from/written to?

If so, I assume I would want to spread my tables across as my allocation groups as possible, correct? Wouldn't this ensure that multiple users querying different tables would get the best performance?

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