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Date: Thu, 23 Dec 2010 01:26:55 +0100
From: Emmanuel Florac <eflorac@intellique.com>
Subject: Re: Anyone using XFS in production on > 20TiB volumes?
Message-ID: <20101223012655.2681c596@galadriel.home>
In-Reply-To: <4D124B71.9030401@sandeen.net>
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To: Eric Sandeen <sandeen@sandeen.net>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>, xfs@oss.sgi.com

Le Wed, 22 Dec 2010 13:03:13 -0600 vous =E9criviez:

> http://xfs.org/index.php/XFS_FAQ#Q:_I_want_to_tune_my_XFS_filesystems_for=
_.3Csomething.3E
> =

> which mentions getting your geometry right if it's hardware raid
> that can't be detected automatically.

Just as a side note : I tried several times to manually set the
filesystem layout to precisely match the underlying hardware RAID
with sunit and swidth but didn't find that it made a noticeable
difference. On my 39.9 TB systems, the default agcount is 39, while the
optimum would be (theorically at least)  42. =


-- =

------------------------------------------------------------------------
Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac@intellique.com>
                    |   +33 1 78 94 84 02
------------------------------------------------------------------------

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