[linux-lvm] lvm2, extending a physical volume
Jan Dittmer
j.dittmer at portrix.net
Tue Jul 8 05:00:01 UTC 2003
Hi,
I posted this a while ago on lvm-devel, but received no answer.
I'm using kernel 2.5(.74-mm2) with LVM2 and have a RAID5 to which I
added a new disk with raidreconf. This worked fine, but lvm doesn't
recognize the extra disk space:
# pvdisplay
--- Physical volume ---
PV Name /dev/md0
VG Name myraid
PV Size 335.36 GB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 85853
Free PE 0
Allocated PE 85853
PV UUID wZQg66-cWrF-VDi5-GcRN-aYVg-RQQ3-PPm5K5
but:
# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath]
md0 : active raid5 hdc1[4] hdh1[3] hdf1[2] hdg1[1] hde1[0]
468872704 blocks level 5, 4k chunk, algorithm 2 [5/5] [UUUUU]
which translates to ~480 GB (5x 120GB)
Somewhere I found a post, that with vgcfgbackup / vgcfgrestore one is
able to resize the volume. But simply backing up and restoring the
descriptor just gets me to the same situation.
As I've another partition (which isn't that important) I tried to change
the backup manually, ie. I changed pe_count in the backup file and
restored it. This works fine - but how do I figure the correct PE count
for this bigger disk? I just don't want to poke around until it says,
'hey, too big, trashing your data'. There has to be a simple way, I
guess, which I totally overlook. It isn't that big of a change.
pvresize tells me it isn't implemented.
Thanks for any insight,
Jan
# vgdisplay --version
LVM version: 1.95.15 (2003-01-10)
Library version: 0.96.08-ioctl (2003-03-27)
Driver version: 1.0.6
--
Linux rubicon 2.5.74-mm2-jd4 #1 SMP Sun Jul 6 09:55:20 CEST 2003 i686
More information about the linux-lvm
mailing list