From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
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To: | "Andrej Ricnik-Bay" <andrej(dot)groups(at)gmail(dot)com> |
Cc: | "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: file system and raid performance |
Date: | 2008-08-07 22:12:58 |
Message-ID: | dcc563d10808071512j4f586afcld7782bdb85307e4a@mail.gmail.com |
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Lists: | pgsql-performance |
On Thu, Aug 7, 2008 at 3:57 PM, Andrej Ricnik-Bay
<andrej(dot)groups(at)gmail(dot)com> wrote:
> 2008/8/8 Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>:
>> noatime turns off the atime write behaviour. Or did you already know
>> that and I missed some weird post where noatime somehow managed to
>> slow down performance?
>
> Scott, I'm quite aware of what noatime does ... you didn't miss a post, but
> if you look at Mark's graphs on
> http://wiki.postgresql.org/wiki/HP_ProLiant_DL380_G5_Tuning_Guide
> they pretty much all indicate that (unless I completely misinterpret the
> meaning and purpose of the labels), independent of the file-system,
> using noatime slows read/writes down (on average).
Interesting. While a few of the benchmarks looks noticeably slower
with noatime (reiserfs for instance) most seem faster in that listing.
I am just now setting up our big database server for work and noticed
a MUCH lower performance without noatime.
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