I happened to move a physical device between a few volume groups and then tried to do a pvmove which failed for a lack of sufficient extents. This was quite surprising because I knew that there should be enough PEs. A little experimentation revealed what was going on: # pvcreate -f -M2 /dev/sd[pq]1 Physical volume "/dev/sdp1" successfully created Physical volume "/dev/sdq1" successfully created # vgcreate vg20 -s32M -M2 /dev/sdp1 /dev/sd[pq]1 Volume group "vg20" successfully created # vgdisplay -v vg20 <cut> --- Physical volumes --- PV Name /dev/sdp1 PV UUID 6dKzli-EgUp-ChPM-Rgaj-S74F-DTd5-AkCMsW PV Status allocatable Total PE / Free PE 469 / 469 PV Name /dev/sdq1 PV UUID L2rapn-MRCZ-9bKt-4gp7-vcqa-mxZN-UBvARN PV Status allocatable Total PE / Free PE 469 / 469 So each physical device has 469 extents. After a vgreduce/vgextend: # vgreduce vg20 /dev/sdp1 ; vgextend vg20 /dev/sdp1 Removed "/dev/sdp1" from volume group "vg20" Volume group "vg20" successfully extended # vgdisplay -v vg20 <cut> --- Physical volumes --- PV Name /dev/sdq1 PV UUID L2rapn-MRCZ-9bKt-4gp7-vcqa-mxZN-UBvARN PV Status allocatable Total PE / Free PE 469 / 469 PV Name /dev/sdp1 PV UUID 6dKzli-EgUp-ChPM-Rgaj-S74F-DTd5-AkCMsW PV Status allocatable Total PE / Free PE 468 / 468 Notice that sdp1 now only has 468 PEs. I lose one PE everytime I vgreduce/vgextend: # vgreduce vg20 /dev/sdp1 ; vgextend vg20 /dev/sdp1 Removed "/dev/sdp1" from volume group "vg20" Volume group "vg20" successfully extended # vgreduce vg20 /dev/sdp1 ; vgextend vg20 /dev/sdp1 Removed "/dev/sdp1" from volume group "vg20" Volume group "vg20" successfully extended # vgreduce vg20 /dev/sdp1 ; vgextend vg20 /dev/sdp1 Removed "/dev/sdp1" from volume group "vg20" Volume group "vg20" successfully extended # vgdisplay -v vg20 <cut> --- Physical volumes --- PV Name /dev/sdq1 PV UUID L2rapn-MRCZ-9bKt-4gp7-vcqa-mxZN-UBvARN PV Status allocatable Total PE / Free PE 469 / 469 PV Name /dev/sdp1 PV UUID 6dKzli-EgUp-ChPM-Rgaj-S74F-DTd5-AkCMsW PV Status allocatable Total PE / Free PE 465 / 465 If I recreate the PV, then I get all 469 PEs back. Is this an expected behaviour? I'm pretty sure I did not run into this with LVM1 (we recently upgraded). Here are my system specs: # vgdisplay --version LVM version: 2.01.08 (2005-03-22) Library version: 1.01.02 (2005-05-17) Driver version: 4.4.0 # cat /etc/redhat-release Fedora Core release 4 (Stentz) Thanks, -poul _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
