Niels,
             Below are the two issues that I noticed and created bugs for 
tracking.
             1)  For disperse volumes hole punch is currently not supported. 
The support seems to be in works.
                   https://bugzilla.redhat.com/show_bug.cgi?id=1394298

             2)  For a replica/distribute volume after punching hole in the 
file the reported size is not correct.
                   You could see the description of problem in 
                   https://bugzilla.redhat.com/show_bug.cgi?id=1398381

Thanks and Regards,
Ram                   

-----Original Message-----
From: Niels de Vos [mailto:[email protected]] 
Sent: Monday, November 28, 2016 10:32 AM
To: Ankireddypalle Reddy
Cc: [email protected]; Gluster Devel ([email protected])
Subject: Re: [Gluster-devel] Hole punch support

On Thu, Nov 24, 2016 at 03:58:01PM +0000, Ankireddypalle Reddy wrote:
> Hi,
>       Gluster does not seem to be supporting hole punch support correctly. 
> This might be a limiting factor for people switching from hardware based 
> storage  to glusterfs for archival/backup use cases.  In these use cases hole 
> punch support is one of the key deciding factors. I request gluster 
> developers to expedite their efforts in this direction.

Hi Ram,

this is something we should be able to fix somehow. There is a similar bug 
reported for this already:

  fallocate + punch_hole used instead of fallocate + zero_range in 
glfs_discard()
  https://bugzilla.redhat.com/show_bug.cgi?id=1327857

>From a cursory look, libgfapi supports punching holes through the
glfs_discard() function. FUSE also has an implementation for fallocate().

How are you testing this, and what is the behaviour you see?

Thanks,
Niels
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