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Re: extremely slow write performance plaintext

To: xfs@xxxxxxxxxxx
Subject: Re: extremely slow write performance plaintext
From: Cory Coager <ccoager@xxxxxxxxxxxxxxx>
Date: Fri, 14 Jan 2011 15:48:30 -0500
Banner: Set
Cc: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
In-reply-to: <4D30A945.4060000@xxxxxxxxxxxxxxxxx>
Organization: Davis Vision
References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@xxxxxxxxxxxxxxx> <20110113233527.6dca104d@xxxxxxxxxxxxxx> <18993_1294964274_4D2F9632_18993_1387_1_F79CF9ADB27B2646B59221B7355263830CC143B1@xxxxxxxxxxxxxxxxxxxxxxxx> <4D30A945.4060000@xxxxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7
On 01/14/2011 02:51 PM, Stan Hoeppner wrote:
Make sure the write cache on the P600 (what size is it BTW?) is enabled and that
the BBU is in working order.  Also make sure the P600 is disabling the write
caches on the drives themselves.  Then...

Write cache is enabled on the controller, the size is 512MB, BBU is in good conditioned (checked with the HP utility). How do I check the write cache on the drives?
Mount with 'nobarrier' so XFS isn't interfering with the hardware cache
performance of the P600.  With barriers enabled (the default) XFS will
periodically flush the cache on the RAID card causing write performance 
problems.

Already using nobarrier.



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