| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Scott Carey <scott(at)richrelevance(dot)com> |
| Cc: | Craig James <craig_james(at)emolecules(dot)com>, Whit Armstrong <armstrong(dot)whit(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: partition question for new server setup |
| Date: | 2009-04-29 00:19:56 |
| Message-ID: | dcc563d10904281719o6eef8f53xa486a4073e442069@mail.gmail.com |
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| Lists: | pgsql-performance |
On Tue, Apr 28, 2009 at 5:58 PM, Scott Carey <scott(at)richrelevance(dot)com> wrote:
> 1. If everything is on the same partition/file system, fsyncs from the
> xlogs may cross-pollute to the data. Ext3 is notorious for this, though
> data=writeback limits the effect you especially might not want
> data=writeback on your OS partition. I would recommend that the OS, Data,
> and xlogs + etc live on three different partitions regardless of the number
> of logical RAID volumes.
Note that I remember reading some comments a while back that just
having a different file system, on the same logical set, makes things
faster. I.e. a partition for OS, one for xlog and one for pgdata on
the same large logical volume was noticeably faster than having it all
on the same big partition on a single logical volume.
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