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Re: Recommended/Not Recommended Hosts?

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com>
Cc: Jason DiCioccio <jd(at)ods(dot)org>, Sailesh Krishnamurthy <sailesh(at)gmail(dot)com>, Josh Livni <josh(at)umbrellaconsulting(dot)com>, SF Postgres <sfpug(at)postgresql(dot)org>
Subject: Re: Recommended/Not Recommended Hosts?
Date: 2009-12-15 23:59:18
Message-ID: (view raw, whole thread or download thread mbox)
Lists: sfpug
> Seek performance on the non-EBS default drive is poor -- but if I'm
> reading the bonnie++ output right, the EBS volume otherwise wasn't
> really faster - and perhaps even slower than the default drive for block
> reads and writes.   Also if I read the bonnie++ output right, strangely,
> block reads seem much slower with a 7-EBS-volume RAID array than with a
> single EBS block.  RAID helped the writes significantly, though.

Yeah, that's fairly odd.  Is it possible that the CPU overhead of the SW
RAID is eating a lot of your available CPU?

It would also be great to run Bonnie 1.95 and look at lag times.


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