On Mon, Nov 14, 2005 at 07:20:59PM +0530, Block Device wrote: > I want to know whether Linux provides any standard interface for > volume managers etc so that applications can register themselves to be > notified when a snapshot needs to be taken. Not yet, but it's a reasonable thing to ask for. > If there isnt any such interface how is consistency guaranteed for > application data when a snapshot is taken ? eg. How does one take > (consistent) snapshots of database instances w/o first quiescing them > ? At the moment you have to do things the other way around: quiesce database lvcreate -s wake database There already exists an in-kernel filesystem hook so that mounted filesystems get the notifications automatically so they can sync their metadata, and the block devices get flushed. Alasdair -- agk@redhat.com _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
