[Bug 1361659] Re-Review Request: vdsm - Virtual Desktop Server Manager

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https://bugzilla.redhat.com/show_bug.cgi?id=1361659

Nir Soffer <nsoffer@xxxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |nsoffer@xxxxxxxxxx
              Flags|                            |needinfo?(dougsland@redhat.
                   |                            |com)



--- Comment #20 from Nir Soffer <nsoffer@xxxxxxxxxx> ---
(In reply to Douglas Schilling Landgraf from comment #17)
> There is a depends bug, moving back to assign.

We cannot fix this bug for 4.0, as this break backward compatibility.

For example, existing setup (e.g. ovirt-3.6) with running vms is using /rhev/*
for all disks:

    /rhev/data-center/pool-id/domain-id/images/image-id/volume-id

During live migrating to a host running new version (e.g. ovirt-4.0), a new
vm is started on the destination host, using the same configuration as the old
vm, meaning the path to the disk will be the same.

If we move /rhev to the proper location (e.g. /run/vdsm/data-center), live vm
migration from older hosts will not be possible. Same issue exists when live
migrating vms from new version using /run/vdsm ot old version using /rhev.

So this change will require stopping running vms and starting them on hosts
using different disk location. This may be a big problem for users, so it is 
not possible to change in 4.0.

For the next major version, we plan to dynamically change the path to the disks
during migration, enabling migration from old version using /rhev to new
version
using /run/vdsm. Since this is a very risky change, there is no way we can do
this in a stable version (4.0). Only critical fixes are allowed in 4.0.

I think we should remove the dependency on bug 1260743.

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