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Re: XFS drops create/delete files to 6.6% of EXT3 (software raid) and to

To: "David Chinner" <dgc@xxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: XFS drops create/delete files to 6.6% of EXT3 (software raid) and to 0.6% of EXT3 (3ware hardware raid)
From: "Michael Darling" <darlingm@xxxxxxxxx>
Date: Thu, 24 Apr 2008 11:39:39 -0400
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On Thu, Apr 24, 2008 at 2:31 AM, David Chinner <dgc@xxxxxxx> wrote:
> Are you using write caching on the RAID card? If yes, then you need a BBU
> for the card if you want to enable the write cache safely.

I am using write caching.  Without write caching, the 3ware
9650SE-4LMPL crawls along at 5MB/sec writing.  3ware tech support said
awful write performance without write caching to a RAID 5 was typical,
that write caching really needs to be on for a RAID 5.

Is nobarrier safe to use, as long as before putting real data on the
RAID I obtain a BBU for the 3ware card, in addition to the existing
battery backup for the server as a whole?

On Thu, Apr 24, 2008 at 10:20 AM, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote:
> Which program is this that you are using to measure this, bonnie++, or?

I'm also using bonnie++, v1.03 from http://www.coker.com.au/bonnie++/

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