Deepak C Shetty has posted comments on this change.

Change subject: WIP: Introduce prepareForBackup vdsm verb
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Patch Set 3:

@MarkWu,

Re: 1) We use qemu-nbd so that in future when the backup appliance is hosted on 
a physical host (not in VM) then too it should work. qemu-nbd provides the 
ability to export a disk image over network as a block device irrespective of 
virt/host app and backup software vendors too need block device interface for 
backing up data

Re. 2) Backup VA is a VM inside oVirt DC host and all host can access all 
storage, so adding more constraints just for Backup case is not preferred. Also 
in future we also need to support possibility of Backup running directly on 
anotehr host. Also backup server is a 3rd party app, which will access oVirt 
via REST APIs only, its doens't make sense for it to be able to expose to the 
different storage domain of oVirt.. All it needs is access to a block device 
using which it will perform backup.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I8ccacda2b09810a71f445ed65de6a09336ea3fb1
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Deepak C Shetty <[email protected]>
Gerrit-Reviewer: Adam Litke <[email protected]>
Gerrit-Reviewer: Allon Mureinik <[email protected]>
Gerrit-Reviewer: Ayal Baron <[email protected]>
Gerrit-Reviewer: Deepak C Shetty <[email protected]>
Gerrit-Reviewer: Eduardo <[email protected]>
Gerrit-Reviewer: Federico Simoncelli <[email protected]>
Gerrit-Reviewer: Mark Wu <[email protected]>
Gerrit-Reviewer: Sharad Mishra <[email protected]>
Gerrit-Reviewer: Vinzenz Feenstra <[email protected]>
Gerrit-Reviewer: oVirt Jenkins CI Server
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