[linux-lvm] writable snapshots ? (a la timefinder BCV)
Heinz J . Mauelshagen
mauelshagen at sistina.com
Wed May 22 03:44:02 UTC 2002
On Sun, May 19, 2002 at 11:22:59AM +0200, David Stes wrote:
> There is an option --snap to the lvcreate utility to create a read-only snapshot(frozen image) of a volume.
> Is there a possibility to quickly create a rw (read/write) snapshot of a logical volume ?
Beside other enhancements this is in 1.1-rcX which you can find
in CVS at www.sistina.com.
*** This is still in stabilization! Don't use it on production systems! ***
> I'm thinking here of applications in the style of EMC Timefinder BCV's (bcv = business continuance volumes).
> For example, I want to create a snapshot of a mounted volume running Informix.
> The snapshot of the mounted logical volume will be inconsistent, but it appears then to contain a 'crashed' instance of Informix, and when mounting the snapshot, I'd like to replay logfiles (do a recovery on the crashed instance) for which I need read/write access to the snapshot ...
You can do this and other things (for eg.: full fsck on the writable snapshot
to check a filesystems integrity).
> Thank you,
> David Stes.
> linux-lvm mailing list
> linux-lvm at sistina.com
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
Mauelshagen at Sistina.com +49 2626 141200
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