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Re: Vacuum Problems

From: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>
To: "Rafael Domiciano" <rafael(dot)domiciano(at)gmail(dot)com>
Cc: "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, "Rafael Martinez" <r(dot)m(dot)guerrero(at)usit(dot)uio(dot)no>, "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Vacuum Problems
Date: 2008-12-08 16:35:08
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
On Mon, Dec 8, 2008 at 9:29 AM, Rafael Domiciano
<rafael(dot)domiciano(at)gmail(dot)com> wrote:
> 1 Drive Only. This server has no RAID.
> Do you think that the I/O is very high and I'm needing a RAID?!

Not necessarily.  Like I said, my laptop currently is about 25 to 30
times faster writing to disk than your server.  So, I think something
is wrong.  Try doing this, run vmstat 1, and while that's running, in
another window, do something like:

time dd if=/dev/zero of=/mnt/myslowdrive/testfile bs=1000000 count=500
time dd of=/dev/null if=/mnt/myslowdrive/testfile

and see what vmstat says while that's running, and how long it takes.
I'm guessing something is very wrong and you'll get really low

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