| From: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
|---|---|
| To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
| Cc: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, "Craig A(dot) James" <cjames(at)modgraph-usa(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Reliability recommendations |
| Date: | 2006-02-25 00:29:55 |
| Message-ID: | 43FFA503.5070700@paradise.net.nz |
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| Lists: | pgsql-performance |
Luke Lonergan wrote:
>
> I'd be more shocked if this weren't also true of nearly all SCSI HW RAID
> adapters of this era. If you had ordered an HP DL380 server you'd get about
> the same performance.
>
> BTW - I don't think there's anything reasonable about 50-55 MB/s from 6
> disks, I'd put the minimum for this era machine at 5 x 30 = 150MB/s.
>
He was quoting for 6 disk RAID 10 - I'm thinking 3 x 30MB/s = 90MB/s is
probably more correct? Having aid that, your point is still completely
correct - the performance @55MB/s is poor (e.g. my *ata* system with 2
disk RAID0 does reads @110MB/s).
cheers
Mark
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