[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 ?



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