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List:       linux-xfs
Subject:    Re: Anyone using XFS in production on > 20TiB volumes?
From:       Justin Piszcz <jpiszcz () lucidpixels ! com>
Date:       2010-12-22 19:24:23
Message-ID: alpine.DEB.2.00.1012221424180.6932 () p34 ! internal ! lan
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On Wed, 22 Dec 2010, Chris Wedgwood wrote:

> On Wed, Dec 22, 2010 at 12:35:46PM -0500, Justin Piszcz wrote:
>
>> Is this by specifying the sunit/swidth?
>
> yes
>
>> Can you elaborate on which paramters you modified?
>
> i set both to match what the hw raid was doing, the lru that is my
> brain doesn't have the detail anymore sorry
>
> at a guess it was probably something like 64k chunk, 20 devices wide
>
>
> the metadata performance difference between wrong and right is quite
> noticable
>
>
>> Yes and have it set to perform(ance).
>
> be sure you have a bbu, there is a setting for force wc --- i wouldn't
> do that
>
> i would have it wc when the battery is good automatically disable it
> when it's bad
>
> i was able to buffer ~490MB of writes in the card without trying hard,
> that's a lot of pain to get corrupted
>
>> Going to be using 19HDD x 3TB Hiatchi 7200RPMs, (18HDD RAID-6 + 1
>> hot spare).
>
> are those 4k sector drives?  i ask because it's not clear if/how the
> raid fw deals with these
>

Hi, they are 512 byte sector drives.

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