| From: | Greg Smith <greg(at)2ndquadrant(dot)com> |
|---|---|
| To: | Greg Spiegelberg <gspiegelberg(at)gmail(dot)com> |
| Cc: | Yeb Havinga <yebhavinga(at)gmail(dot)com>, Matthew Wakeling <matthew(at)flymine(dot)org>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Testing Sandforce SSD |
| Date: | 2010-07-26 18:40:43 |
| Message-ID: | 4C4DD6AB.6000805@2ndquadrant.com |
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| Thread: | |
| Lists: | pgsql-performance |
Greg Spiegelberg wrote:
> Speaking of the layers in-between, has this test been done with the
> ext3 journal on a different device? Maybe the purpose is wrong for
> the SSD. Use the SSD for the ext3 journal and the spindled drives for
> filesystem?
The main disk bottleneck on PostgreSQL databases are the random seeks
for reading and writing to the main data blocks. The journal
information is practically noise in comparison--it barely matters
because it's so much less difficult to keep up with. This is why I
don't really find ext2 interesting either.
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.us
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