On Wed, Aug 22, 2007 at 07:33:35PM +0400, Dmitry Potapov wrote:
Hello!
We run a large (~66Gb) web-backend database on Postgresql 8.2.4 on
Linux. The hardware is Dual Xeon 5130 with 16Gb ram, LSI Megaraid U320-2x
scsi controller w/512Mb writeback cache and a BBU. Storage
On Aug 22, 2007, at 10:57 AM, Kenneth Marshall wrote:
On Wed, Aug 22, 2007 at 07:33:35PM +0400, Dmitry Potapov wrote:
Hello!
We run a large (~66Gb) web-backend database on Postgresql
8.2.4 on
Linux. The hardware is Dual Xeon 5130 with 16Gb ram, LSI Megaraid
U320-2x
scsi
On Thu, 23 Aug 2007, Dmitry Potapov wrote:
I'm planning to do so, but before I need to take a look at postgresql source
and dev documentation to find how exactly IO is done, to be able to explain
the issue to linux kernel people.
I can speed that up for you.
Hello!
We run a large (~66Gb) web-backend database on Postgresql 8.2.4 on
Linux. The hardware is Dual Xeon 5130 with 16Gb ram, LSI Megaraid U320-2x
scsi controller w/512Mb writeback cache and a BBU. Storage setup contains 3
raid10 arrays (data, xlog, indexes, each on different
Are you able to show that the dirty pages are all coming from postgres?
Cheers,
mark
--
Mark Mielke [EMAIL PROTECTED]
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TIP 5: don't forget to increase your free space map settings
2007/8/22, Joshua D. Drake [EMAIL PROTECTED]:
We've run into an issue of IO storms on checkpoints. Once in 20min
(which is checkpoint_interval) the database becomes unresponsive for
about
4-8 seconds. Query processing is suspended, server does nothing but
writing
What are your
2007/8/22, Mark Mielke [EMAIL PROTECTED]:
Are you able to show that the dirty pages are all coming from postgres?
I don't know how to prove that, but I suspect that nothing else except
postgres writes to disk on that system, because it runs nothing except
postgresql and syslog (which I
2007/8/22, Kenneth Marshall [EMAIL PROTECTED]:
You are working at the correct level. The bgwriter performs the I/O
smoothing
function at the database level. Obviously, the OS level smoothing function
needed to be tuned and you have done that within the parameters of the OS.
You may want to
On Wed, 22 Aug 2007, Dmitry Potapov wrote:
I found this http://www.westnet.com/~gsmith/content/linux-pdflush.htm
If you do end up following up with this via the Linux kernel mailing list,
please pass that link along. I've been meaning to submit it to them and
wait for the flood of
