From: | "Luke Lonergan" <LLonergan(at)greenplum(dot)com> |
---|---|
To: | "Dave Cramer" <pg(at)fastcrypt(dot)com> |
Cc: | "Adam Weisberg" <Aweisberg(at)seiu1199(dot)org>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Hardware/OS recommendations for large databases ( |
Date: | 2005-11-15 14:33:25 |
Message-ID: | 3E37B936B592014B978C4415F90D662D01995FD4@MI8NYCMAIL06.Mi8.com |
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Lists: | pgsql-performance |
Dave,
________________________________
From: pgsql-performance-owner(at)postgresql(dot)org
[mailto:pgsql-performance-owner(at)postgresql(dot)org] On Behalf Of Dave Cramer
Sent: Tuesday, November 15, 2005 6:15 AM
To: Luke Lonergan
Cc: Adam Weisberg; pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Hardware/OS recommendations for large
databases (
Luke,
Have you tried the areca cards, they are slightly faster yet.
No, I've been curious since I read an earlier posting here. I've had a
lot more experience with the 3Ware cards, mostly good, and they've been
doing a lot of volume with Rackable/Yahoo which gives me some more
confidence.
The new 3Ware 9550SX cards use a PowerPC for checksumming, so their
write performance is now up to par with the best cards I believe. We
find that you still need to set Linux readahead to at least 8MB
(blockdev --setra) to get maximum read performance on them, is that your
experience with the Arecas? We get about 260MB/s read on 8 drives in
RAID5 without the readahead tuning and about 400MB/s with it.
- Luke
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