[linux-lvm] Limitation: Snapshots does not work in cluster enviroment ?
Daniel Schwager
daniel.schwager at dtnet.de
Sat Apr 14 15:44:49 UTC 2007
Alasdair G Kergon schrieb:
>> So, i want to use snapshot1 on server1, snapshot2 on server2. The
>> original LV (where the snapshot is created from) is not in use (not mounted on any
>> server)
>>
..
> I think the userspace LVM code could be tweaked to support this
> configuration. Until then, you'll need to activate the snapshots
> manually using dmsetup directly.
>
This would be fine.
>
> Userspace changes we'd need for the tools (dmsetup) to support this:
> Permit a snapshot to be activated without its corresponding origin.
> - requires a snapshot exclusive lock (already supported)
> - requires an origin lock that prevents any node having origin active
> (implementation needs more thought but it should be possible)
>
>
So, thank you very much for your detailed explanation. Would
an implementaion change on "dmsetup" also solve the "Limitation of 32
snapshots" ?
Or is there a another possibility to fix/workaround this topic ?
regards
Danny
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