[linux-lvm] lvm2 tools can't locate pvs on entire disks

[Miles Crawford]

I'm running into trouble here, getting the lvm scanning tools to 
notice PVs I have created on entire disks, like this:

pvcreate /dev/hdd

Some output:

root at end root # lvm version
   LVM version:     2.01.04 (2005-02-09)
   Library version: 1.01.00-ioctl (2005-01-17)
   Driver version:  4.1.0
root at end root # uname -a
Linux end.snip.net 2.6.8 #6 Sat Oct 9 20:59:02 PDT 2004 i686 
GNU/Linux
root at end root # lvmdiskscan
   /dev/hda1  [      111.79 GB]
   /dev/hdb1  [       18.63 GB]
   /dev/hdd1  [      186.31 GB]
   /dev/hdb2  [      127.59 GB]
   /dev/hdb3  [        2.83 GB]
   0 disks
   5 partitions
   0 LVM physical volume whole disks
   0 LVM physical volumes
root at end root # pvscan
   No matching physical volumes found

Well that's odd, I know they're there.  Lets try this:

root at end root # losetup /dev/loop0 /dev/hda
root at end root # losetup /dev/loop1 /dev/hdd
root at end root # pvscan
   PV /dev/loop0   VG media_vg   lvm2 [111.79 GB / 0    free]
   PV /dev/loop1   VG media_vg   lvm2 [186.31 GB / 0    free]
   Total: 2 [298.10 GB] / in use: 2 [298.10 GB] / in no VG: 0 [0   ]


There, now that they're not raw disks anymore I can find them with all 
the scanning utiliies and vgchange -a y them back to life.

Is this expected behavior?

-Miles
______________
Miles Crawford
Software Developer, The Catalyst Group
Educational Partnerships & Learning Technologies
University of Washington
206.616.8156
http://catalyst.washington.edu