Phillip Susi <psusi@cfl.rr.com> writes: >> LVM has a generation counter as well. It's only updated on metadata >> writes though, so it doesn't cost anything. (Log is not part of metadata >> in this sense.) When you lose a leg (and use dmeventd), the metadata on >> the remaining PVs is updated to say that. The leg is also yanked from >> the mirror. You can add it as a fresh image (with full resync) if it >> ever comes back. > > Why a full resync? With mdadm, it just keeps flagging the dirty chunks > so it only has to copy those when the other disk returns. Because it's really hard to guarantee anything when you experience a failure. The safe route is to discard any data on the failed drive. Certainly better than winding up with a subtly corrupt mirror. As I said before, if you experience that a lot, you should be using replication not mirroring. Yours, Petr. _______________________________________________ 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/
