I can see the appeal in consistent behavior, but I'm not sure we want CloudStack to always follow a least-common-denominator approach.
Personally I recommend we leave XenServer's functionality here as is. On Thu, Nov 7, 2013 at 6:14 AM, SuichII, Christopher <chris.su...@netapp.com > wrote: > Thanks for replying, Kelvin. > > Now, should we only not allow this on VMWare, or should we prohibit it on > XenServer as well. It appears to work fine on XenServer, but it may be a > good idea to have a consistent experience, regardless of hypervisor. > > -Chris > -- > Chris Suich > chris.su...@netapp.com > NetApp Software Engineer > Data Center Platforms – Cloud Solutions > Citrix, Cisco & Red Hat > > On Nov 6, 2013, at 9:09 PM, Kelven Yang <kelven.y...@citrix.com> wrote: > > > We should dis-allow detaching volume from VM when it has VM snapshots. > > VMware keeps VM snapshot meta information at VM basis, disk membership > > change behind its back will cause problem and it does not provide > official > > API to manipulate at volume level for a VM snapshot. > > > > This is a bug > > > > Kelven > > > > On 11/6/13, 5:58 AM, "SuichII, Christopher" <chris.su...@netapp.com> > wrote: > > > >> Bumping this. I believe we need the imput of a VMWare expert, please. > >> > >> -Chris > >> -- > >> Chris Suich > >> chris.su...@netapp.com > >> NetApp Software Engineer > >> Data Center Platforms Cloud Solutions > >> Citrix, Cisco & Red Hat > >> > >> On Nov 5, 2013, at 1:46 PM, Mike Tutkowski < > mike.tutkow...@solidfire.com> > >> wrote: > >> > >>> OK, well, depending on if we can or can't get a VMware person to chime > >>> in > >>> on this issue, we may have to disallow disks from being detached from > >>> VMware VMs with snapshots in 4.3. > >>> > >>> > >>> On Tue, Nov 5, 2013 at 11:44 AM, SuichII, Christopher < > >>> chris.su...@netapp.com> wrote: > >>> > >>>> Correct. > >>>> > >>>> #6 FAILS with VMWare and SUCCEEDS with Xen > >>>> > >>>> -- > >>>> Chris Suich > >>>> chris.su...@netapp.com > >>>> NetApp Software Engineer > >>>> Data Center Platforms Cloud Solutions > >>>> Citrix, Cisco & Red Hat > >>>> > >>>> On Nov 5, 2013, at 1:35 PM, Mike Tutkowski > >>>> <mike.tutkow...@solidfire.com> > >>>> wrote: > >>>> > >>>>> I assume 6 fails with VMware, as well? > >>>>> > >>>>> Is Xen OK with 6? > >>>>> > >>>>> > >>>>> On Tue, Nov 5, 2013 at 11:26 AM, SuichII, Christopher < > >>>>> chris.su...@netapp.com> wrote: > >>>>> > >>>>>> FWIW, after looking into this more with Xen, when the VM is restored > >>>>>> in > >>>>>> step 4, it simply no longer has the volume attached, so this appears > >>>>>> to > >>>>>> really be a VMWare issue. Any VMWare experts out there know how we > >>>>>> can > >>>>>> handle this? > >>>>>> > >>>>>> -Chris > >>>>>> -- > >>>>>> Chris Suich > >>>>>> chris.su...@netapp.com > >>>>>> NetApp Software Engineer > >>>>>> Data Center Platforms Cloud Solutions > >>>>>> Citrix, Cisco & Red Hat > >>>>>> > >>>>>> On Nov 5, 2013, at 1:05 PM, SuichII, Christopher < > >>>> chris.su...@netapp.com> > >>>>>> wrote: > >>>>>> > >>>>>>> We currently don¹t 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. > >>>>>>> > >>>>>>> Does anyone else have any thoughts on whether this is a bug or not? > >>>> IMO, > >>>>>> on VMWare, this set of steps can get users into a state where they > >>>>>> can > >>>> no > >>>>>> longer attach new data disks to their VM, so it appears to be a bug > >>>>>> of > >>>> some > >>>>>> kind. > >>>>>>> > >>>>>>> -Chris > >>>>>>> -- > >>>>>>> Chris Suich > >>>>>>> chris.su...@netapp.com > >>>>>>> NetApp Software Engineer > >>>>>>> Data Center Platforms Cloud Solutions > >>>>>>> Citrix, Cisco & Red Hat > >>>>>>> > >>>>>> > >>>>>> > >>>>> > >>>>> > >>>>> -- > >>>>> *Mike Tutkowski* > >>>>> *Senior CloudStack Developer, SolidFire Inc.* > >>>>> e: mike.tutkow...@solidfire.com > >>>>> o: 303.746.7302 > >>>>> Advancing the way the world uses the > >>>>> cloud<http://solidfire.com/solution/overview/?video=play> > >>>>> * * > >>>> > >>>> > >>> > >>> > >>> -- > >>> *Mike Tutkowski* > >>> *Senior CloudStack Developer, SolidFire Inc.* > >>> e: mike.tutkow...@solidfire.com > >>> o: 303.746.7302 > >>> Advancing the way the world uses the > >>> cloud<http://solidfire.com/solution/overview/?video=play> > >>> * * > >> > > > > -- *Mike Tutkowski* *Senior CloudStack Developer, SolidFire Inc.* e: mike.tutkow...@solidfire.com o: 303.746.7302 Advancing the way the world uses the cloud<http://solidfire.com/solution/overview/?video=play> *™*
