On Mon, Sep 19, 2011 at 07:15:09PM -0400, Johnny Tan wrote:
Anyway, here's the real issue with LVM, at least in CentOS-6:
[root@jttest ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_main-lv_root 1548144 1548144 0 100% /
[root@jttest ~]# lvextend -L 2G /dev/vg_main/lv_root /etc/lvm/archive/.lvm_jttest.pp.local_5523_51321310: write error failed: No space left on device Volume group "vg_main" metadata archive failed. /etc/lvm/cache/.cache.tmp: write error failed: No space left on device
Many LVM modifications make a backup of the lvm metadata, which typically resides in /etc/lvm. You might try the -A n switch to disable the automatic backups (after strongly heeding the advice in man lvm; but as you said, on a test system, it's fine to play with). On a production system, if your / fills to 0 available blocks you've probably got bigger problems. :) So I imagine it's probably not a problem the LVM developers are too worried about (i.e., they may feel that the -A switch is sufficient to handle it).
--keith