I too tried to make a pv on a loop device when I first downloaded lvm and ran into a stone wall. Stepping through the code that Mika pasted the debugging output from suggested it was not supported but I didn't know how to fix it. On Wed, Dec 12, 2001 at 09:53:05PM +0200, Mika Lansirinne wrote: > Harri Haataja wrote: > > On Wed, Dec 12, 2001 at 06:16:31PM +0200, Mika Lansirinne wrote: > > > I was trying to use a loop device(s) for LVM. In the pvcreate man-page it > is > > > said that a PV can also be a loopback file. That also seem to work > correct. > > > But when I try to create a VG on that I get: > > > > > > [root@arthur /tmp]# vgcreate tmpvg /dev/loop0 > > > vgcreate -- no valid physical volumes in command line > > > > I didnt bother to look deep into those messages but first though that > > came into my mind is that you didn't mention losetup. You did this? > > Sorry, probably should have mentioned that to be complete. I indeed did use > losetup first. (And I can create filesystem to that and can mount that. No > problem with the loop device itself). > > These are the steps I have done: > dd if=/dev/zero of=lvm-file bs=1M count=XX > losetup /dev/loop0 lvm-file > pvcreate /dev/loop0 > => pvcreate -- physical volume "/dev/loop0" successfully created > vgcreate tmpvg /dev/loop0 > => vgcreate -- no valid physical volumes in command line > -- mailto:thecap@usa.net http://www.ece.utexas.edu/~thecap/ 28 70 20 71 2C 65 29 61 9C B1 36 3D D4 69 CE 62 4A 22 8B 0E DC 3E
