| From: | Alan Hodgson <ahodgson(at)simkin(dot)ca> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Experience with HP Smart Array P400 and SATA drives? |
| Date: | 2008-12-05 23:30:01 |
| Message-ID: | 200812051530.01258@hal.medialogik.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
> >>> Mario Weilguni <mweilguni(at)sime(dot)com> wrote:
> > strange values. An individual drive is capable of delivering 91
> > MB/sec
>
> > sequential read performance, and we get values ~102MB/sec out of a
> > 8-drive RAID5, seems to be ridiculous slow.
What command are you using to test the reads?
Some recommendations to try:
1) /sbin/blockdev --setra 2048 device (where device is the partition or LVM
volume)
2) Use XFS, and make sure your stripe settings match the RAID.
Having said that, 102MB/sec sounds really low for any modern controller with
8 drives, regardless of tuning or filesystem choice.
--
Corporations will ingest natural resources and defecate garbage until all
resources are depleted, debt can no longer be repaid and our money becomes
worthless - Jay Hanson
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Greg Smith | 2008-12-06 00:29:49 | Re: Experience with HP Smart Array P400 and SATA drives? |
| Previous Message | Scott Marlowe | 2008-12-05 23:00:53 | Re: Experience with HP Smart Array P400 and SATA drives? |