[ovirt-devel] In-place sparsify support in VDSM

[Shmuel Melamud]

Hi!

There is an RFE being implemented currently (
https://bugzilla.redhat.com/show_bug.cgi?id=734120) to use --inplace option
in virt-sparsify to sparsify a disk image in-place, without copying it.

The problem is that in-place sparsify works on NFS only starting from NFS
4.2, while the copying implementation supposedly works with any storage.

>From my point of view, it is better to remove the old code and start with
the new code that uses --inplace and just add to document that one will
need NFS >= 4.2 for sparsify feature to work. Although the old
implementation exists, it is not used currently so there are no actual
users that may be affected by the change. If it will be a crying need to
use sparsify on older NFS or some other incompatible storage, we can add it
later on the base of the new code. The old code is far from ideal and we
will need to rewrite it in any case, and there is not sense to do this
without real need.

What do you think?

Shmuel
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