Hi LVM Gurus, >From what I've read around, it is not possible to take a snapshot of an LVM snapshot. Is this something that is worked upon currently as a future enhancement? If not, why not? To give you a background, we're working on a periodic (xen) VM checkpointing project, using LVM for VM disk checkpointing. As we take several snapshots of the same volume, the write throughput reduces drastically. I conjecture this is because, for each write to the (base) volume, each of the snapshots' mappings is checked to decide whether to copy the blocks to the snapshot or not. It seems that this can be helped by: - taking a snapshot of the latest snapshot and having the writes go to the new snapshot or - making LVM use only the latest snapshot for CoW as writes go to the base volume. Any suggestions/pointers greatly appreaciated. thanks, Prashanth _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
