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Re: Bad RAID1 read performance

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: (view raw, whole thread or download thread mbox)
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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