On 23/02/11 14:16, Joe Thornber wrote: > And how do I zero just exception store? In this example, the normal lv is c1_s1. It has two snapshots, c1_s1_snap0 and c1_s1_snap1. List the underlying volumes like so: [root@clonebox2 ~]# ls -1 /dev/mapper/clones-c1_s1* /dev/mapper/clones-c1_s1 /dev/mapper/clones-c1_s1-real /dev/mapper/clones-c1_s1_snap0 /dev/mapper/clones-c1_s1_snap0-cow /dev/mapper/clones-c1_s1_snap1 /dev/mapper/clones-c1_s1_snap1-cow Half of those would be hidden to lvdisplay, though the man page will probably tell you how to show hidden LVs. "ls" shows them all. c1_s1_snap0-cow and c1_s1_snap1-cow are the copy on write volumes, the exception stores, I believe. -real is where the current data lives, and c1_s1, the "main" LV is a basically a proxy which reads directly from -rela, but diverts writes so that old data is copied to -cow. -snap0 is a proxy which reads from either -cow or -real as needed. Hopefully someone will tell me where I'm wrong, if I am. Zeroing c1_s1 first, then c1_s1_snap0-cow would zero everything, or zeroing -real and -cow would be more efficient because you avoid the copy on write penalty when zeroing the origin. I haven't actually tested this, only reasoned through it. -- Ray Morris support@bettercgi.com Strongbox - The next generation in site security: http://www.bettercgi.com/strongbox/ Throttlebox - Intelligent Bandwidth Control http://www.bettercgi.com/throttlebox/ Strongbox / Throttlebox affiliate program: http://www.bettercgi.com/affiliates/user/register.php On Wed, 23 Feb 2011 14:18:29 +0000 Jonathan Tripathy <jonnyt@abpni.co.uk> wrote: > > _______________________________________________ > 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/ > _______________________________________________ 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/
