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Date: Wed, 4 Dec 2013 14:58:35 +0000 (UTC)
From: "Likitha Shetty (JIRA)" <jira@apache.org>
To: cloudstack-issues@incubator.apache.org
Message-ID: <JIRA.12679242.1384447246259.70263.1386169115932@arcas>
In-Reply-To: <JIRA.12679242.1384447246259@arcas>
References: <JIRA.12679242.1384447246259@arcas>
Subject: [jira] [Resolved] (CLOUDSTACK-5172) Removing disks from VMWare VMs
 with snapshots causes problems
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     [ https://issues.apache.org/jira/browse/CLOUDSTACK-5172?page=3Dcom.atl=
assian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Likitha Shetty resolved CLOUDSTACK-5172.
----------------------------------------

    Resolution: Fixed

Detaching/attaching VM volume is not allowed if there are VM snapshots, bec=
ause any changes to the disk layout will break the semantics of VM-based sn=
apshot.
refer - [https://cwiki.apache.org/confluence/display/CLOUDSTACK/VM+Snapshot=
s]
Therefore don't allow volume detach if the associated VM has snapshots


> Removing disks from VMWare VMs with snapshots causes problems
> -------------------------------------------------------------
>
>                 Key: CLOUDSTACK-5172
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-517=
2
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the defa=
ult.)=20
>          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=E2=80=99t allow volumes to be attached to VMs with snaps=
hots 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 =E2=80=94 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 =E2=80=94 FAILS since you ca=
nnot attach volumes to VMs with snapshots
> 6) Attempt to delete the VM snapshot =E2=80=94 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 differen=
tly than Xen.
> After discussion on the dev list, it sounds like the proper course of act=
ion would be to prohibit disks from being detached from VMWare VMs with sna=
pshots.


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