[linux-lvm] Snapshot documentation

Heinz Mauelshagen mauelsha at ez-darmstadt.telekom.de
Wed Mar 8 08:12:51 UTC 2000

Enabling you to create snapshots with less space than that of the
Original Logical Volume is an option to save space in case you have
data which doesn't change a lot.

The only chance to deal with for eg. a filesystem which changes rapidly
and in the extrem case totally is to create equal sized snapshots.


> Hi,
> Been playing with snapshots and am noticing I can create a snapshot with
> less PE's than my source LV that I'm snapshotting, with the small side
> effect of:
> lvcreate -- WARNING: all snapshots will be disabled if more than 12 MB are
> changed
> Is the above message implying that if I change more than 12MB of data on
> my source LV that the snapshot is then defunct/useless?  Does that include
> deletes, etc?
> Mainly a pointer to any information or documentation regarding how this
> all works would be well appreciated.  I'm noticing LVM has some HP history
> involved, so I'll go see if they have relevant data in their HPUX docs.
> Maybe this is included in the recent EN-HOWTO I noticed mention of as
> well?


Systemmanagement CS-TS                           T-Nova
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
Senior Systems Engineer                          Postfach 10 05 41
                                                 64205 Darmstadt
mge at EZ-Darmstadt.Telekom.de                      Germany
                                                 +49 6151 886-425

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