Re: Anyone using XFS in production on > 20TiB volumes?

[Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>]

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.