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From: Joshua D. Drake <jd@commandprompt.com>
To: Alex Deucher <alexdeucher@gmail.com>
Cc: Jeff Frost <jeff@frostconsultingllc.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: strange performance regression between 7.4 and 8.1
Date: Thu, 01 Mar 2007 17:46:56 -0800
Message-ID: <45E78210.9030401@commandprompt.com> (raw)
In-Reply-To: <a728f9f90703011744s5e54bd4aq905e0fcc41811e90@mail.gmail.com>
References: <a728f9f90703011244r577d56d7y422ab4bd71bb760e@mail.gmail.com>
	<45E73C90.2080206@commandprompt.com>
	<a728f9f90703011306u674e766t9c158723bdb0d43c@mail.gmail.com>
	<Pine.LNX.4.64.0703011334410.3892@discord.home.frostconsultingllc.com>
	<a728f9f90703011350w1f2f1f9u69b1783461aabe3@mail.gmail.com>
	<Pine.LNX.4.64.0703011353520.3892@discord.home.frostconsultingllc.com>
	<a728f9f90703011412kd8c8535wad5058319d07ede0@mail.gmail.com>
	<Pine.LNX.4.64.0703011633390.3892@discord.home.frostconsultingllc.com>
	<a728f9f90703011744s5e54bd4aq905e0fcc41811e90@mail.gmail.com>

\
>> Is the SAN being shared between the database servers and other
>> servers?  Maybe
>> it was just random timing that gave you the poor write performance on
>> the old
>> server which might be also yielding occassional poor performance on
>> the new
>> one.
>>
> 
> The direct attached scsi discs on the old database server we getting
> 45MBps not the SAN.  The SAN got 62/145Mbps, which is not as bad. 

How many spindles you got in that SAN?

 We
> have 4 servers on the SAN each with it's own 4 GBps FC link via an FC
> switch.  I'll try and re-run the numbers when the servers are idle
> this weekend.
> 
> Alex
> 


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