| From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
| Cc: | Arjen van der Meijden <acmmailing(at)tweakers(dot)net>, Rajesh Kumar Mallah <mallah(dot)rajesh(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller |
| Date: | 2009-02-05 14:04:25 |
| Message-ID: | 871vudm13q.fsf@oxford.xeocode.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> writes:
> We purhcased the Perc 5E, which dell wanted $728 for last fall with 8
> SATA disks in an MD-1000 and the performance is just terrible. No
> matter what we do the best throughput on any RAID setup was about 30
> megs/second write and 60 Megs/second read.
Is that sequential or a mix of random and sequential (It's too high to be
purely random i/o)? A single consumer drive should be able to beat those
numbers on sequential i/o. If it's a mix of random and sequential then
performance will obviously depend on the mix.
> I can get that from a mirror set of the same drives under linux kernel
> software RAID.
Why is that surprising? I would expect software raid to be able to handle 8
drives perfectly well assuming you had an controller and bus you aren't
saturating.
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Ask me about EnterpriseDB's On-Demand Production Tuning
| From | Date | Subject | |
|---|---|---|---|
| Next Message | hubert depesz lubaczewski | 2009-02-05 14:13:35 | Re: Number of occurrence of characters? |
| Previous Message | Ivan Voras | 2009-02-05 13:31:24 | Number of occurrence of characters? |