On 01/22/2013 11:12 AM, Hauke Laging wrote:
Isn't that at least misleading? Is it really possible to create a snapshot of e.g. /dev/sda5 without creating an *additional* device as snapshot origin?
It's possible but as you note you have to create the dm layers for the snapshot. This means that if a non-dm device is in use you have to shut its users down (unmount file systems etc.), create the snapshot and then re-mount.
I've frequently used this in the past to snapshot large zero targets to create sparse devices for testing (before --virtualsize was added to LVM2).
With device-mapper devices this is unnecessary since the top-level device may be suspended while the snapshot layers are inserted.
Regards, Bryn. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
