cloudstack-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Somesh Naidu <Somesh.Na...@citrix.com>
Subject RE: Question about migrating local storage datadisks
Date Mon, 11 Jul 2016 13:25:57 GMT
Yes, as long as the hypervisor host where the VM is running in step #5 does not have access
to the storage where the datadisk currently resides.

Regards,
Somesh

-----Original Message-----
From: technopathology@gmail.com [mailto:technopathology@gmail.com] On Behalf Of Douglas Land
Sent: Thursday, July 07, 2016 1:30 AM
To: users@cloudstack.apache.org
Subject: Re: Question about migrating local storage datadisks

So I'm not sure I understood you correctly but the steps as I tries them
were:
1) shut down a VM
2) detach datadisk
3) migrate VM
4) re-attach datadisk??
5) restart the VM

Is that the correct scenario where cloudstack should migrate the datadisk
for me?


On Wed, Jul 6, 2016 at 4:35 PM, Douglas Land <dsl@looprock.com> wrote:

> Thanks Somesh, I'll try just moving the VM and see if it triggers a
> datadisk migration.
>
> Sorry, by 'bring up' I just meant migrate to a new host.
>
>
> On Wednesday, July 6, 2016, Somesh Naidu <Somesh.Naidu@citrix.com> wrote:
>
>> First off, for datadisks, you may not explicitly need to move them
>> around. If you detach it from the existing VM and attach it to another VM
>> (essentially the host running that VM) that does not have access to the
>> storage where the datadisk currently resides, then cloudstack will copy the
>> datadisk to a storage accessible to that host.
>>
>> > I’m confused why we can’t snapshot a datadisk, which, if I understand
>> > correctly, should then get copied to secondary storage, and then bring
>> it
>> > up on another host. I hope I’m just missing something obvious.
>>
>> You can snapshot a datadisk and the snapshot will reside on the secondary
>> store, that bit is straight/correct.
>>
>> I do not understand what you mean when you say "bring it up on another
>> host".
>> The part that is not clear is what does "bring it up" mean? Also, what
>> you mean by "host", hypervisor or storage? Do you mean the datadisks are
>> bootable and you want to start them on a different host? If so, know that
>> you can't launch a VM directly off of a snapshot, you’d have to convert it
>> to a template and then launch a VM from it. The VM could be launched on any
>> host - if this is the use-case/scenario you had in mind then yes, you will
>> achieve what you need this way.
>>
>> Regards,
>> Somesh
>>
>>
>> -----Original Message-----
>> From: technopathology@gmail.com [mailto:technopathology@gmail.com] On
>> Behalf Of Douglas Land
>> Sent: Wednesday, July 06, 2016 3:03 PM
>> To: users@cloudstack.apache.org
>> Subject: Question about migrating local storage datadisks
>>
>> We use local storage for everything, including datadisks. We need to
>> migrate these to another host, which docs all seem to say isn’t supported.
>> I’m confused why we can’t snapshot a datadisk, which, if I understand
>> correctly, should then get copied to secondary storage, and then bring it
>> up on another host. I hope I’m just missing something obvious.
>>
>
Mime
View raw message