Phillip Susi wrote: > Jun'ichi Nomura wrote: >> LVM2 does it by putting a linear mapping on top of the origin device. > > How does this work? I'm trying to figure out the whole locking business > and it seems that mounting the device, or using it as a target in a dm > table place an exclusive lock on the device, so how can you add a linear > mapping to the origin device, if it is already used as a target in the > snapshot device, and thus locked? So, you have to put the linear mapping *before* that. Then, the top-level block device will be locked but you can still change the underlying mappings. Thanks, -- Jun'ichi Nomura, NEC Corporation of America -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
