Re: RAID halting

[CoolCold <coolthecold@gmail.com>]

On Sat, Apr 25, 2009 at 12:25 AM, Richard Scobie <richard@sauce.co.nz> wrote:
> Doug Ledford wrote:
>
>>> Also, in my reading it was suggested by several researchers the best
>>> performance of an XFS file system is achieved if the stripe width of the
>>> FS
>>> is set to be the same as the RAID array using the su and sw switches in
>>> mkfs.xfs.
>>
>> This is true of any raid aware file system.  I know how to do this for
>> ext3, but not for xfs, so I won't comment further on that.  However, the
>> stripe size is always chunk size * number of non-parity drives on a parity
>> based array.
>
> mkfs.xfs will will query the md device for no. of devices and stripe size
> and automatically set this optimally (su and sw).

It will, but need dmsetup installed.

>
> If an array is later grown, these two values will need to be manually
> calculated and then be applied as mount options.
>
> Regards,
>
> Richard
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-- 
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Best regards,
[COOLCOLD-RIPN]
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