[linux-lvm] problems with basic lvm commands on Debian

[Faheem Mitha]

Dear People,

I must be missing something obvious, but I'm having problems with basic 
commands on Debian Sarge, using lvm2.

I installed lvm2 and dmsetup. I'm using the stock Debian kernel 
2.6.8-2-386.

I can do basic manipulations using /dev/hda1, but not with /dev/hda2.

This is on a very ordinary Dell Optiplex, normal x86 architecture.

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root at io:/home/faheem# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda2             37483592    300352  35279136   1% /
tmpfs                   258052         0    258052   0% /dev/shm
/dev/hda1               918322     14622    854704   2% /boot

   Physical volume "/dev/hda2" successfully created

root at io:/dev/mapper# pvcreate /dev/hda1

root at io:/dev/mapper# pvdisplay /dev/hda1
   --- Physical volume ---
   PV Name               /dev/hda1
   VG Name               testvg
   PV Size               956.00 MB / not usable 0
   Allocatable           yes
   PE Size (KByte)       4096
   Total PE              239
   Free PE               239
   Allocated PE          0
   PV UUID               sGOTrW-ttC4-m4uq-Cwck-V5s3-knz7-NpydvJ

root at io:/dev/mapper# vgcreate testvg /dev/hda1
   Volume group "testvg" successfully created
root at io:/dev/mapper# vgdisplay testvg
   --- Volume group ---
   VG Name               testvg
   System ID
   Format                lvm2
   Metadata Areas        1
   Metadata Sequence No  1
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                0
   Open LV               0
   Max PV                0
   Cur PV                1
   Act PV                1
   VG Size               956.00 MB
   PE Size               4.00 MB
   Total PE              239
   Alloc PE / Size       0 / 0
   Free  PE / Size       239 / 956.00 MB
   VG UUID               IHrOgz-RWDW-EIAY-m9vD-idgT-1I99-cyoS8n

root at io:/dev/mapper# pvcreate /dev/hda2
   Physical volume "/dev/hda2" successfully created

All good so far. However.

root at io:/dev/mapper# pvdisplay /dev/hda2
   No physical volume label read from /dev/hda2
   Failed to read physical volume "/dev/hda2"

root at io:/home/faheem# vgextend testvg  /dev/hda2
   No physical volume label read from /dev/hda2
   /dev/hda2 not identified as an existing physical volume
   Unable to add physical volume '/dev/hda2' to volume group 'testvg'.

Any idea what is going on here? This is a new installation, and only has 
the bare bones on it.

Please cc me on any reply. Thanks in advance.

                                                      Faheem.