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Re: [dm-devel] LVM Snapshot Feature




On Aug,Friday 1 2008, at 9:35 AM, Bombardier, Pascal wrote:

Hi,

In your opinion, does it make sense to be able to create non- persistent
snapshots ?
In the case of a filesystem backup, a non-persistent snapshot would be a snapshot that we agree to lose in case of failure or reboot. If anything
happens, a server administrator would have to recreate a new snapshot
and then restart the backup.
In this case, I think metadata could be stored in memory instead of on
disk, which should improve LVM snapshot performance.

Is this theory wrong, and is this something which can be implemented
easily in the current LVM code ?


AFAIK non-persistent snapshots are already implemented see
DM_PERSISTENT_DEV_FLAG ? I haven't look at linux kernel code how is
it done but when I solve my lvcreate -s bug on NetBSD non-persistent
snapshots are next :).

Regards

Adam.


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