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[linux-lvm] pvmove



Hi everyone

I'm new to the mailing list but not to LVM, until now everything was crystal clear and working fine. Now I'm either stuck or found a minor issue. I'm trying to move move extents on a physical volume. Not from one physical volume to another.

root myhost# pvmove  /dev/md127:151808-152063 /dev/md127:152064-152319
  No extents available for allocation
root myhost#

I also tried pvmove /dev/md127:151808-152063 /dev/md127:152064 and a few other combination. There are enough free extents. The volume I've created is 1G. There's 800 GB free. I made sure the destination blocks are available, I've tried different ranges. Way below is the output of vgdisplay and a list of volumes and their extents.

Is this functionality (extent shuffling) supported? I mean is this a feature, bug or ignorance on my part?

PS, if you're wondering why would anyone want to move extents from a device to the very same device, you may notice in the output below that I have a few volumes spilt into pieces and I want to de-fragment it. I know it won't affect performance too much, probably at all. But it is going to help when (if?) I'm in dire need of dd if=/dev/xxx from the physical volume. Wouldn't be the first time (not the fault of LVM, disk+heat=bad blocks).

Thanks in advance for any ideas or scolding :-)

Martin

root myhost# vgdisplay
  --- Volume group ---
  VG Name               volume
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  147
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                12
  Open LV               9
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               3.35 TiB
  PE Size               4.00 MiB
  Total PE              878905
  Alloc PE / Size       666880 / 2.54 TiB
  Free  PE / Size       212025 / 828.22 GiB
  VG UUID Gv2rC8-sMgQ-xGGK-5swv-9Gck-QA1G-k50ABy

root myhost# vgs --all -o +lv_name,lv_size,snap_percent,seg_pe_ranges,segtype,seg_size VG #PV #LV #SN Attr VSize VFree LV LSize Snap% PE Ranges Type SSize volume 1 12 0 wz--n- 3.35t 828.22g home 150.00g /dev/md127:0-25599 linear 100.00g volume 1 12 0 wz--n- 3.35t 828.22g home 150.00g /dev/md127:72085-74495 linear 9.42g volume 1 12 0 wz--n- 3.35t 828.22g home 150.00g /dev/md127:309248-319636 linear 40.58g volume 1 12 0 wz--n- 3.35t 828.22g var 20.00g /dev/md127:25600-30719 linear 20.00g volume 1 12 0 wz--n- 3.35t 828.22g usr 20.00g /dev/md127:30720-35839 linear 20.00g volume 1 12 0 wz--n- 3.35t 828.22g tmp 2.00g /dev/md127:35840-36351 linear 2.00g volume 1 12 0 wz--n- 3.35t 828.22g p2p 300.00g /dev/md127:74496-151295 linear 300.00g volume 1 12 0 wz--n- 3.35t 828.22g boot 1.00g /dev/md127:151296-151551 linear 1.00g volume 1 12 0 wz--n- 3.35t 828.22g root 4.00g /dev/md127:152320-153343 linear 4.00g volume 1 12 0 wz--n- 3.35t 828.22g copy 2.00t /dev/md127:181248-309247 linear 500.00g volume 1 12 0 wz--n- 3.35t 828.22g copy 2.00t /dev/md127:606208-712298 linear 414.42g volume 1 12 0 wz--n- 3.35t 828.22g copy 2.00t /dev/md127:156672-181247 linear 96.00g volume 1 12 0 wz--n- 3.35t 828.22g copy 2.00t /dev/md127:36352-72084 linear 139.58g volume 1 12 0 wz--n- 3.35t 828.22g copy 2.00t /dev/md127:319637-549524 linear 898.00g volume 1 12 0 wz--n- 3.35t 828.22g swap 8.00g /dev/md127:153344-155391 linear 8.00g volume 1 12 0 wz--n- 3.35t 828.22g emulate 50.00g /dev/md127:549525-562324 linear 50.00g volume 1 12 0 wz--n- 3.35t 828.22g test 1.00g /dev/md127:151552-151807 linear 1.00g volume 1 12 0 wz--n- 3.35t 828.22g test2 1.00g /dev/md127:151808-152063 linear 1.00g
root myhost#



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