On Sun, May 18, 2003 at 10:58:23PM +0800, armani wrote: > Thanks for toby's explainations! > == > Eventually I create a new snapshot of my LV partition. > But I have another problem with the snapshot of LV. > That is how much snapshot I could create for my LV partition ? > As I know some commercial software could create 254 snapshots for one LV > such as IBM. > > So I try to create another snapshot for LV by issuing the following command: > > This is my first snapshot for /dev/Vol1/LV1 > > [root@met root]# lvcreate --size 100M -s -nsnapshot /dev/Vol1/LV1 > lvcreate -- WARNING: the snapshot will be automatically disabled once it > gets full > lvcreate -- INFO: using default snapshot chunk size of 64 KB for > "/dev/Vol1/snapshot" > lvcreate -- doing automatic backup of "Vol1" > lvcreate -- logical volume "/dev/Vol1/snapshot" successfully created > > I tried to create another snapshot for /dev/Vol1/LV1 > > [root@met root]# lvcreate --size 100M -s -nsnapshot1 /dev/Vol1/LV1 > lvcreate -- WARNING: the snapshot will be automatically disabled once it > gets full > lvcreate -- INFO: using default snapshot chunk size of 64 KB for > "/dev/Vol1/snapshot1" > lvcreate -- doing automatic backup of "Vol1" > lvcreate -- logical volume "/dev/Vol1/snapshot1" successfully created > > And how can I estimate the sizes and counts for them ? lvdisplay /dev/Vol1/snapsh* > Is there any rules or principles to formalize the procedures ? There's no tool in the LVM distro for that so far. You can write a script (Shell, Perl, ...) around lvdisplay to create alerts when a snapshot runs out of space or extend it automatically. > > > > A snapshot will only capture what you have in the fs at the moment you > -- snip -- > > -toby > > -- Armani Liao > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ -- Regards, 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 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
