From: David Rees <drees76@gmail.com>
To: Scott Carey <scott@richrelevance.com>
Cc: Mark Kirkwood <markir@paradise.net.nz>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Raid 10 chunksize
Date: Tue, 24 Mar 2009 19:04:42 -0700
Message-ID: <72dbd3150903241904t39a2304cv806b228cbaef3036@mail.gmail.com> (raw)
In-Reply-To: <C5EEDB84.3B34%scott@richrelevance.com>
References: <49C98433.5080709@paradise.net.nz>
<C5EEDB84.3B34%scott@richrelevance.com>
On Tue, Mar 24, 2009 at 6:48 PM, Scott Carey <scott@richrelevance.com> wrote:
> Your xlogs are occasionally close to max usage too -- which is suspicious at
> 10MB/sec. There is no reason for them to be on ext3 since they are a
> transaction log that syncs writes so file system journaling doesn't mean
> anything. Ext2 there will lower the sync times and reduced i/o utilization.
I would tend to recommend ext3 in data=writeback and make sure that
it's mounted with noatime over using ext2 - for the sole reason that
if the system shuts down unexpectedly, you don't have to worry about a
long fsck when bringing it back up.
Performance between the two filesystems should really be negligible
for Postgres logging.
-Dave
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To: pgsql-performance@postgresql.org
Cc: drees76@gmail.com, scott@richrelevance.com, markir@paradise.net.nz
Subject: Re: Raid 10 chunksize
In-Reply-To: <72dbd3150903241904t39a2304cv806b228cbaef3036@mail.gmail.com>
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