Hi,
There is a funny problem with lvcreate. When you create a snap, it assumes the second element in the supplied path is a volume group. This is untrue when the device mapper is used, and it is untrue (obviously) if symbolic links to the block device are used. The text in the attachment demonstrates what I mean.
I think it's a bad thing to use path names for determining what volume group has to be used.
This is on debian/sarge i386 with LVM2 2.01.04-2 and kernel 2.6.11 with dm_mod.ko and dm_snapshot.ko loaded.
Greets,
--Walter
--
*** If you build it, they will come ***Walter de Jong walter@sara.nl http://www.sara.nl/ HPC Systems Programmer at SARA Computing and Network Services
People should be able to e-mail me, spambots should not.
root# lvcreate -s -L 200g -n snap_home_lv /dev/mapper/sara_vg-home_lv Volume group "mapper" doesn't exist root# lvcreate -s -L 200g -n snap_home_lv /dev/sara_vg/home_lv Logical volume "snap_home_lv" created root# ls -l /dev/mapper/sara_vg-home_lv brw------- 1 root root 254, 2 Mar 7 20:51 /dev/mapper/sara_vg-home_lv root# ls -l /dev/sara_vg/home_lv lrwxrwxrwx 1 root root 27 Mar 17 14:18 /dev/sara_vg/home_lv -> /dev/mapper/sara_vg-home_lv root# ls -lL /dev/sara_vg/home_lv brw------- 1 root root 254, 2 Mar 7 20:51 /dev/sara_vg/home_lv root# ln -s /dev/sara_vg /dev/blah root# lvcreate -s -L 200g -n snap_home_lv /dev/blah/home_lv Volume group "blah" doesn't exist
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