;
> Thanks,
>
> Anjan
>
> _
>
> From: Woody Woodring [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, August 30, 2005 2:30 PM
> To: 'Rémy Beaumont'; pgsql-performance@postgresql.org
> Subject: Re: [PERFORM] High load and iowait but no disk access
>
>
?
Thanks,
Anjan
From: Woody Woodring
[mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 30, 2005
2:30 PM
To: 'Rémy Beaumont';
pgsql-performance@postgresql.org
Subject: Re: [PERFORM] High load
and iowait but no disk access
Have you tried a different kernel?
We run with a n
nt'; pgsql-performance@postgresql.org
Subject: Re: [PERFORM] High load and iowait but no disk access
Have you tried a different kernel? We run with a netapp over NFS
without any issues, but we have seen high IO-wait on other Dell boxes
(running and not running postgres) and RHES 3. We
On 30-Aug-05, at 14:32, Josh Berkus wrote:
Remy,
The behavior we see is that when running queries that do random reads
on disk, IOWAIT goes over 80% and actual disk IO falls to a crawl at a
throughput bellow 3000kB/s (We usually average 4 kB/s to 8
kB/s
on sequential read operations
ehalf Of Rémy
BeaumontSent: Monday, August 29, 2005 9:43 AMTo:
pgsql-performance@postgresql.orgSubject: [PERFORM] High load and
iowait but no disk access
We have been trying to pinpoint what originally seem to be a I/O
bottleneck but which now seems to be an issue with either Postgresql or RHES
Remy,
> The behavior we see is that when running queries that do random reads
> on disk, IOWAIT goes over 80% and actual disk IO falls to a crawl at a
> throughput bellow 3000kB/s (We usually average 4 kB/s to 8 kB/s
> on sequential read operations on the netapps)
This seems pretty low fo
On 30-Aug-05, at 12:29, Tom Lane wrote:
=?ISO-8859-1?Q?R=E9my_Beaumont?= <[EMAIL PROTECTED]> writes:
On 30-Aug-05, at 12:15, Tom Lane wrote:
I know zip about NetApps, but doesn't the 8th column indicate pretty
steady disk reads?
Yes, but they are very low.
Sure, but that's more or less w
=?ISO-8859-1?Q?R=E9my_Beaumont?= <[EMAIL PROTECTED]> writes:
> On 30-Aug-05, at 12:15, Tom Lane wrote:
>> I know zip about NetApps, but doesn't the 8th column indicate pretty
>> steady disk reads?
> Yes, but they are very low.
Sure, but that's more or less what you'd expect if the thing is random
=?ISO-8859-1?Q?R=E9my_Beaumont?= <[EMAIL PROTECTED]> writes:
> The stats of the NetApp do confirm that it is sitting idle.
Really?
> CPU NFS CIFS HTTP TotalNet kB/s Disk kB/s Tape kB/s
> Cache Cache CP CP Disk DAFS FCP iSCSI FCP kB/s
>
On Mon, Aug 29, 2005 at 09:42:46AM -0400, Rémy Beaumont wrote:
We have been trying to pinpoint what originally seem to be a I/O
bottleneck but which now seems to be an issue with either Postgresql or
RHES 3.
Nope, it's an IO bottleneck.
The behavior we see is that when running queries that d
On 30-Aug-05, at 12:15, Tom Lane wrote:
=?ISO-8859-1?Q?R=E9my_Beaumont?= <[EMAIL PROTECTED]> writes:
The stats of the NetApp do confirm that it is sitting idle.
Really?
CPU NFS CIFS HTTP TotalNet kB/s Disk kB/s Tape kB/s
Cache Cache CP CP Disk DAFS FCP iSCSI
We have been trying to pinpoint what originally seem to be a I/O bottleneck but which now seems to be an issue with either Postgresql or RHES 3.
We have the following test environment on which we can reproduce the problem:
1) Test System A
Dell 6650 Quad Xeon Pentium 4
8 Gig of RAM
OS: RHES 3 upd
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