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Re: Copy file , file blocks is different

To: Homer Li <01jay.ly@xxxxxxxxx>
Subject: Re: Copy file , file blocks is different
From: Ben Myers <bpm@xxxxxxx>
Date: Thu, 24 Jan 2013 12:03:21 -0600
Cc: xfs@xxxxxxxxxxx, Dave Chinner <david@xxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130124104245.GC2667@dastard>
References: <CAG1+85EwFH9mGkVqs=nkSVaX0J82iDMMbQ=____dRstUSsmJpw@xxxxxxxxxxxxxx> <20130124104245.GC2667@dastard>
User-agent: Mutt/1.5.20 (2009-06-14)
Hi Homer,

On Thu, Jan 24, 2013 at 09:42:45PM +1100, Dave Chinner wrote:
> On Thu, Jan 24, 2013 at 05:48:25PM +0800, Homer Li wrote:
> > Hello,
> > 
> >      There are 2 file in the xfs device,  md5 is the same,  but the size is
> > different.
> >       I don't know why .......
> 
> Speculative preallocation. Google "XFS NFS speculative
> preallocation"

Here's another recent thread where this has been discussed.
http://oss.sgi.com/archives/xfs/2013-01/msg00044.html

It is a frequent question on the list, so I think we'll be adding it to the XFS
FAQ soon.  ;)

http://xfs.org/index.php/XFS_FAQ

Regards,
        Ben

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