From: Nathan Scott <nathans@aconex.com>
To: Jeff Zheng <Jeff.Zheng@endace.com>
Cc: xfs@oss.sgi.com
Subject: Re: Is persistant preallocation possible?
Date: Tue, 25 May 2010 12:26:14 +1000 (EST) [thread overview]
Message-ID: <1374176788.272721274754374474.JavaMail.root@mail-au.aconex.com> (raw)
In-Reply-To: <9256268935CF66428AC10E736C91455F024036@nzaklmbx01.ad.endace.com>
----- "Jeff Zheng" <Jeff.Zheng@endace.com> wrote:
> Hi,
>
> We are trying to control where the files are being allocated on the
> disks, and we tried xfs preallocation. What we found is that each time
> the file being reopened the location of the pre-allocated space could
> change (not all the time). Is there a way to do persistent
> preallocation in xfs, like the same file will always be on the same
> location on the disk given that the requested size doesn’t change?
>
Sounds like you are truncating the file (on open?), and hence discarding
the preallocation. XFS preallocation is persistent already, so I think
something you are doing must be discarding those preallocated extents.
Could you post a test program, or sequence of xfs_io commands, that would
demonstrate the problem?
cheers.
--
Nathan
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next prev parent reply other threads:[~2010-05-25 2:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-25 2:05 Is persistant preallocation possible? Jeff Zheng
2010-05-25 2:26 ` Nathan Scott [this message]
2010-05-25 3:19 ` Eric Sandeen
2010-05-25 12:33 ` Roger Willcocks
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