| From: | Albert Cervera Areny <albert(at)sedifa(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Cc: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
| Subject: | Re: Bad RAID1 read performance |
| Date: | 2007-05-31 11:00:49 |
| Message-ID: | 200705311300.50306.albert@sedifa.com |
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| Lists: | pgsql-performance |
As you suggested with two threads I get 42.39 Mb/s in one and 40.70 Mb/s in
the other one, so that's more than 80Mb/s. That's what I expected with a
single thread, so thanks for the information. It seems I will have to buy
better hard drives if I want increased performance...
A Dimecres 30 Maig 2007 22:13, Luke Lonergan va escriure:
> Not for one thread/process of I/O. Mirror sets can nearly double the read
> performance on most RAID adapters or SW RAID when using two or more
> thread/processes, but a single thread will get one drive worth of
> performance.
>
> You should try running two simultaneous processes during reading and see
> what you get.
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