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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-5172) Removing disks from VMWare VMs with snapshots causes problems
Date Wed, 04 Dec 2013 14:54:36 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-5172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838952#comment-13838952
] 

ASF subversion and git services commented on CLOUDSTACK-5172:
-------------------------------------------------------------

Commit 2794a9398f4dd224ce34e49a2318d1b92b234915 in branch refs/heads/4.3 from [~likithas]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=2794a93 ]

CLOUDSTACK-5172. Detaching VM volume is not allowed if there are VM snapshots because any
changes to the disk layout will break the semantics of VM-based snapshot


> Removing disks from VMWare VMs with snapshots causes problems
> -------------------------------------------------------------
>
>                 Key: CLOUDSTACK-5172
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-5172
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Snapshot, VMware
>    Affects Versions: 4.3.0
>            Reporter: Chris Suich
>            Assignee: Likitha Shetty
>            Priority: Critical
>              Labels: snapshot, snapshots, vmware
>             Fix For: 4.3.0
>
>
> We currently don’t allow volumes to be attached to VMs with snapshots and allowing
volumes to be detached causes quite a bug:
> 1) Attach a data disk to a VM
> 2) Snapshot the VM
> 3) Detach the data disk
> 4) Attempt to restore the VM from the snapshot — FAILS since the data disk is no longer
there, although it is expected to be
> 5) Attempt to re-attach the volume to the VM — FAILS since you cannot attach volumes
to VMs with snapshots
> 6) Attempt to delete the VM snapshot — FAILS since the data disk is no longer there,
although it is expected to be
> I have verified the above steps on VMWare, however Xen does not appear to fail on step
4, presumably because VMWare handles snapshots quite differently than Xen.
> After discussion on the dev list, it sounds like the proper course of action would be
to prohibit disks from being detached from VMWare VMs with snapshots.



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