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List:       linux-xfs
Subject:    Re: Anyone using XFS in production on > 20TiB volumes?
From:       Justin Piszcz <jpiszcz () lucidpixels ! com>
Date:       2010-12-23 0:28:29
Message-ID: alpine.DEB.2.00.1012221928050.7452 () p34 ! internal ! lan
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On Thu, 23 Dec 2010, Emmanuel Florac wrote:

> Le Wed, 22 Dec 2010 13:03:13 -0600 vous écriviez:
>
>> 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
> ------------------------------------------------------------------------
>

Hi, I concur, for hardware raid (at least on 3ware cards) I have found it 
makes no difference, thanks for confirming.

Which RAID cards did you use?

Justin.

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