[linux-lvm] Snapshot documentation

[Heinz Mauelshagen]

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.

Heinz

> 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?
> 
-- 

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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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