Re: SSD + RAID - Mailing list pgsql-performance

From Merlin Moncure
Subject Re: SSD + RAID
Date
Msg-id [email protected]
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In response to Re: SSD + RAID  (Greg Smith <[email protected]>)
List pgsql-performance
2009/11/13 Greg Smith <[email protected]>:
> As far as what real-world apps have that profile, I like SSDs for small to
> medium web applications that have to be responsive, where the user shows up
> and wants their randomly distributed and uncached data with minimal latency.
> SSDs can also be used effectively as second-tier targeted storage for things
> that have a performance-critical but small and random bit as part of a
> larger design that doesn't have those characteristics; putting indexes on
> SSD can work out well for example (and there the write durability stuff
> isn't quite as critical, as you can always drop an index and rebuild if it
> gets corrupted).


Here's a bonnie++ result for Intel showing 14k seeks:
http://www.wlug.org.nz/HarddiskBenchmarks

bonnie++ only writes data back 10% of the time.  Why is Peter's
benchmark showing only 400 seeks? Is this all attributable to write
barrier? I'm not sure I'm buying that...

merlin

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