| 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: | 4B2822D6.2030107@agliodbs.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| 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.
--Josh
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