On Tue, Jun 19, 2012 at 11:28:56AM -0400, Mike Snitzer wrote: > > That is an lvm2 BZ but there is further kernel work needed. > > It should be noted that the "external origin" feature was added to the > thinp target with this commit: > http://git.kernel.org/linus/2dd9c257fbc243aa76ee6d > > It is start, but external origin is kept read-only and any writes > trigger allocation of new blocks within the thin-pool. Hmm... maybe this is what I had been told. I thought there was some feature where you could take a read-only thinp snapshot of an external volume (i.e., a pre-existing LVM2 volume, or a block device), and then after that, make read-write snapshots using the read-only snapshot as a base? Is that something that works today, or is planned? Or am I totally confused? And if it is something that works today, is there a web site or documentation file that gives a recipe for how to use it if we want to do some performance experiments (i.e., it doesn't have to be a user friendly interface if that's not ready yet). Thanks, - Ted -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
