From: Nathan Scott <nathans@aconex.com>
To: Green Guy <greentech3000@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: Possible to preallocate files that always begin/end on stripe unit/width?
Date: Sat, 4 Sep 2010 07:19:51 +1000 (EST) [thread overview]
Message-ID: <1211297770.647781283548791361.JavaMail.root@mail-au.aconex.com> (raw)
In-Reply-To: <AANLkTi=NhOdoX0VU7fyvYpgM+mbN8b3vC7QrkKrcnDk=@mail.gmail.com>
----- "Green Guy" <greentech3000@gmail.com> wrote:
> ...
> I know that XFS metadata such as the log, AG info, etc also need to be
> accounted for, but I am not sure the best way to determine how much
> space they will take.
>
> ...
> How can I determine the correct file size and preallocate them in a
> way where they always begin/end on stripe unit/width taking the
> filesystem overhead into account?
> Note: the log needs to stay on the same fs.
>
There's no way to make a guaranteed aligned/sized allocation, but you
can ask for a "best effort" by using the sizing information returned
from the XFS_IOC_FSGEOMETRY syscall (via xfsctl).
cheers.
--
Nathan
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prev parent reply other threads:[~2010-09-03 21:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 20:12 Possible to preallocate files that always begin/end on stripe unit/width? Green Guy
2010-09-03 21:19 ` Nathan Scott [this message]
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