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Re: [linux-lvm] How to monitor and possibly autoextend snapshots



On Oct 27, 2008, at 7:17 AM, Marcin Kałuża wrote:

Hi,
Well, that's not much of help since after it becomes invalid I'll know it
anyway (IO error ;D), so the event is purely informational.


Well, I've thrown together a quick patch that should give you what you want. (I have not compiled/tested it.) We'd have to give it more thought for it to become a permanent feature (or get integrated into LVM), but it should be a nice little hack. If you turn out to like the idea, maybe more discussion will evolve.

You'll have to compile your own kernel with the patch applied, but once you've done so, you should be able to do the following:

# Get snapshot to raise an event when 75% full
prompt> dmsetup message <snapshot device> 0 notify 75
prompt> dmsetup wait <snapshot device>
# Ok, now we are 75% full - let me know when 95% full
prompt> dmsetup message <snapshot device> 0 notify 95
prompt> dmsetup wait <snapshot device>

 brassow

Attachment: snap.patch
Description: Binary data





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