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raid10 write performance - Mailing list pgsql-performance

From Grzegorz Jaśkiewicz
Subject raid10 write performance
Date
Msg-id AANLkTinbKXufTYhNuhNaOW2kWM-simIL3dg0uFX7Ij6g@mail.gmail.com
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Responses Re: raid10 write performance  (Justin Graf <justin@magwerks.com>)
Re: raid10 write performance  (Greg Smith <greg@2ndquadrant.com>)
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Hi folks,

is there a general problem with raid10 performance postgresql on it?
We see very low performance on writes (2-3x slower than on less
performant servers). I wonder if it is solely problem of raid10
configuration, or if it is postgresql's thing.

Would moving WAL dir to separate disk help potentially ?

We're running centos 5.4, and server config is:

x3550 M2, xeon 4c e5530 2.4ghz , 6GB of ram
disks: ibm 300gb 2.5 SAS

raid: serveRAID M5014 SAS/SATA controller

strip size is the default 128k


thanks.

--
GJ

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