LVM snapshot
Alexandre Oliva
aoliva at redhat.com
Wed Aug 18 20:01:14 UTC 2004
On Aug 18, 2004, Chris Adams <cmadams at hiwaay.net> wrote:
> For the same reason, I'd suggest dm-snapshot also be unconditionally
> included. I use snapshots to get consistent backups; if the system were
> rebooted during backup (while the snapshot of / exists), I guess
> dm-snapshot is required, right?
Maybe not. Since it's a separate LV, it's perfectly possible that, if
dm-snapshot is not available in the initrd vgscan, you won't get that
LV active, but will for the rest; later on, after the root fs is
mounted read-write, vgscan runs again, and the module is available, so
you get the snapshot volume up and running.
This is unlike dm-mirror (assuming pvmove actually uses it), since it
modifies existing volumes (e.g., the one holding the rootfs), you may
need dm-mirror early in order to boot up.
--
Alexandre Oliva http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}
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