[PVE-User] taking advantage of the lvm snapshot

[CoolCold]

On Mon, Jul 9, 2012 at 12:28 AM, Holger Ernst <he at ernstdatenmedien.de> wrote:
> Hi Tonci,
>
> I am using a python script to sync a snapshot of a Windows 2008 machine over a laser line (100Mbit/s) to another physical location.
> You find it here: https://gist.github.com/1843764
>
> It takes aprox. 90 min to sync 500GB (depending on amount of changed data) while using all of the line.
Do you have plans to put it in repo, say somewhere on github ?
>
> Regards, Holger
>
>> Auftrag von Tonci Stipicevic
>> Gesendet: Samstag, 7. Juli 2012 00:06
>> An: pve-user at pve.proxmox.com
>> Betreff: [PVE-User] taking advantage of the lvm snapshot
>>
>> Hello to all,
>>
>> I'm running pve2.1 cluster with shared lvm2 storage (nexenta) and am
>> very satisfied so far .
>>
>> scheduled (and manual)  backups are working very good and backup files
>> are copied to another shared nfs storage.
>>
>> So when we have to return to the backup first we have to restore the
>> archive what could last depending on the amount of data .
>> 2nd.. every backup takes time .. but when we make backup of the VM that
>> are on the lvm volumes then 1st step is snapshoting the logical VMID
>> volume  which makes very useful quasi-backup of the VM.
>> We are using it to make archive of the VM in the same time the original
>> VM is running which makes zero-downtime .. which is also very very good.
>>
>> But using this backed-up VM again means restoring it again which also
>> takes time.
>>
>> So my question would be whether this snapshot (i.e. 101-s) could be used
>> to make copy (delta-replica) to  another-equivalent logical volume (i.e.
>> 201 ) on the second storage   so that this 201-VM is ready to run
>> without restoring the archive. So VM201 will always be down so that
>> logvolume cannot be locked ... (Am I right?)
>>
>> I hope dd could do that job but dd cannot transfer only changed blocks
>> next time copying is done ?  or it can ?
>>
>> So my idea would be to make fast cloning of VMs on the another storage
>> that are usable right away !   is there any scenario to achieve this ?
>>
>> This could be something called offline-VM-cloning (for me it is not
>> necessary to achieve drbd features )
>>
>> Since we had snapshot that is done in moment it would very useful if we
>> could transfer only changes over to the 201 volume  ( after the initial
>> full replication )
>>
>>
>> Thank you very much in advance for your attention
>> and help
>>
>> srdačan pozdrav / best regards
>>
>> Tonči Stipičević, dipl. ing. elektr.
>>
>> SUMA Informatika d.o.o.
>> Badalićeva 27 10000 Zagreb
>> fax: 01 5560007
>> mob: 091 1234003
>>
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>
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Best regards,
[COOLCOLD-RIPN]