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Taking an LVM snapshot of the origin whilst a merge of an old snapshot into the origin is in progress?

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linux-howto

http://serverfault.com – The --merge option says Can I reliably take a snapshot of the origin whilst a merge of an old snapshot into the origin is in progress The man page says :"While the merge is in progress, reads or writes to the origin appear as they were directed to the snapshot being merged." However, it's not clear how safe it is to take a snapshot here. I know I could operate on the snap and discard - but that's not the question :) (HowTos)