[Gluster-devel] few queries regarding file snapshot feature in gluster

Humble Devassy Chirammal humble.devassy at gmail.com
Wed Dec 23 03:30:39 UTC 2015

Hi Prasanna,

The feature page has some details about this


On Wed, Dec 23, 2015 at 5:20 AM, Vijay Bellur <vbellur at redhat.com> wrote:

> On 12/21/2015 06:47 AM, Prasanna Kumar Kalever wrote:
>> Hi Team,
>> I have few queries regarding file snapshot feature in gluster
>> what are the limitations of Block device translator and qemu-block
>> translator ?
>> Are we using them some where ?
>> Do we have plans to improve them ?
>> Or someone have a design to implement file snapshot feature ?
> I have not heard much feedback about these two translators. The qemu-block
> functionality can be handy for exposing virtual block devices and due to
> features like native snapshotting, it could be quite interesting in use
> cases that require virtual block devices.
> The qemu-block translator has not been tested of late. A few months back I
> tried mkfs.xfs after attaching the block device and it failed. I did not
> find more time to look into that further.
> file snapshotting could be a possibility with dht2 but I don't think much
> work has happened in that direction.
> The other possibilities for file snapshotting include reflinks and
> overlay. Given that reflinks support is most probably going to land
> sometime in xfs, we might be able to leverage this feature and explore the
> possibility of providing snapshots with backend filesystems that are
> reflink capable (btrfs, xfs etc.).
>> I am really thankful if some one gives more details about qemu-block
>> xlator,
>> I don't see enough documentation regarding this :(
> qemu-block xlator provides the ability to snapshot files by relying on
> qcow2/qed image formats. what specific details are you looking for?
> Avati & Brian probably have the maximum context about this translator.
> Regards,
> Vijay
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