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[linux-lvm] lvm2, extending a physical volume


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


# 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,


# 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

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