| From: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
|---|---|
| To: | "Jeff Trout" <threshar(at)torgo(dot)978(dot)org> |
| Cc: | "Mikael Carneholm" <Mikael(dot)Carneholm(at)WirelessCar(dot)com>, "Kjell Tore Fossbakk" <kjelltore(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Performance with 2 AMD/Opteron 2.6Ghz and 8gig |
| Date: | 2006-07-28 19:22:28 |
| Message-ID: | C0EFB204.2B2A3%llonergan@greenplum.com |
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| Lists: | pgsql-performance |
Jeff,
On 7/28/06 10:31 AM, "Jeff Trout" <threshar(at)torgo(dot)978(dot)org> wrote:
> I'm still not sure about that software 10 read number. something is
> not right there...
It's very consistent with what we've seen before - the hardware RAID
controller doesn't do JBOD with SCSI command queuing like a simple SCSI
controller would do. The Smart Array 6402 makes a very bad SCSI controller
for software RAID.
The hardware results look very good - seems like the 2.6.17 linux kernel has
a drastically improved CCISS driver as compared to what I've previously
seen.
- Luke
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