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Re: linux distro for better pg performance - Mailing list pgsql-performance

From Joseph Shraibman
Subject Re: linux distro for better pg performance
Date
Msg-id 40970058.3040608@selectacast.net
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In response to Re: linux distro for better pg performance  ("J. Andrew Rogers" <jrogers@neopolitan.com>)
Responses Re: linux distro for better pg performance  (James Thornton <james@jamesthornton.com>)
Re: linux distro for better pg performance  (Alan Stange <stange@rentec.com>)
Re: linux distro for better pg performance  (Greg Stark <gsstark@mit.edu>)
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J. Andrew Rogers wrote:

> Do these features make a difference?  Far more than you would imagine.
> On one postgres server I just upgraded, we went from a 3Ware 8x7200-RPM
> RAID-10 configuration to an LSI 320-2 SCSI 3x10k RAID-5, with 256M

Is raid 5 much faster than raid 10?  On a 4 disk array with 3 data disks
and 1 parity disk, you have to write 4/3rds the original data, while on
raid 10 you have to write 2 times the original data, so logically raid 5
should be faster.

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