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From Jan-Arve Nygård <jan.arve.nyg...@gmail.com>
Subject Re: Question regarding VM snapshot restrictions
Date Tue, 28 Apr 2015 10:24:46 GMT
Thanks Anshul, just what i wanted to know :)

-thinktwo

2015-04-28 12:16 GMT+02:00 Anshul Gangwar <anshul.gangwar@citrix.com>:

> These restrictions are not there due to Hypervisor limitations. These
> limitations are due to way this feature is implemented in CloudStack.
> If we allow those operation then they may work fine but in long run they
> may lead to corruption of VM etc. So to avoid those situation these
> restrictions are added till we we figure out the better way.
>
> Regards,
> Anshul
>
> On 28-Apr-2015, at 3:27 pm, Jan-Arve Nygård <jan.arve.nygard@gmail.com
> <mailto:jan.arve.nygard@gmail.com>> wrote:
>
> Thanks Anshul,
>
> I did a quick test with adding vCPU and NIC in XenCenter after creating a
> snapshot through CloudStack. I also tried reverting the VM to the snapshots
> afterwards with the vCPU and NIC still added, and it worked OK.
>
> This made curious about what the background and details for this patch is.
> If it's specific to any hypervisor/version and maybe is fixed in XenServer
> 6.5?
>
> If you have some more details about why this was patched I could maybe help
> about with testing this with XenServer 6.5.
>
>
> -thinktwo
>
> 2015-04-28 10:32 GMT+02:00 Anshul Gangwar <anshul.gangwar@citrix.com
> <mailto:anshul.gangwar@citrix.com>>:
>
> Hi Jan-Arve,
>
> In which order have you tried adding vCPUs and NICs?
> i.e. After creating VM snapshot or before creating snapshot.
> And have you deleted VM snapshots before adding vCPUs and NICs?
>
> Regards,
> Anshul
>
> On 24-Apr-2015, at 5:58 pm, Jan-Arve Nygård <jan.arve.nygard@gmail.com
> <mailto:jan.arve.nygard@gmail.com>
> <mailto:jan.arve.nygard@gmail.com>> wrote:
>
> Hi,
>
> With 4.5 there are some restrictions applied to VMs that have VM snapshots.
> According to CLOUDSTACK-7688
> <https://issues.apache.org/jira/browse/CLOUDSTACK-7688> VM snapshot stops
> working when the following operations are performed on VM with VM
> snapshots:
>
> 1. Volumes of VM are migrated to other storage
> 2. Add and remove NIC to/from VM
> 3. Attach and Detach volume to VM
> 4. Scale up/down of VM(change service offering)
> 5. Volume snapshot which is not major use case in this scenario
> 6. Resize volume
> 7. Live migration of VM which involves storage migration
>
> Does anyone have more technical details about why this is restricted?
>
> I tried some quick tests with XenServer 6.5 and CS 4.5.1 and I was able to
> both revert and take VM snapshots in CloudStack while adding vCPU and NICs
> on the hypervisor.
>
> Thanks,
>
> -thinktwo
>
>
>
>

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