Bug 202116 – LVM2 Volumes that are once used by XEN-HVM machine keep open

• Product: Gentoo Linux
• Status: RESOLVED OBSOLETE

[Description David Steinberg 2007-12-13 11:28:38 UTC]

I am using Xen with LVM2. When I create a vm in HVM - Mode (full-virtualized), the used logical Volume keeps open after the virtual machine ist stoped. Even after reboot, there ist always one "thing" that keeps the lv open. The problem is that I cannot access the lv any other way than with xen.
I think that there is something in Xen, that forget to set the partition back to "unused"
lvdisplay shows:
  --- Logical volume ---
  LV Name                /dev/vms/server2003
  VG Name                vms
  LV UUID                noTd9j-nVqZ-tuUL-pnLt-9ZSc-7phZ-Px2P1o
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                10.00 GB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1

  --- Logical volume ---
  LV Name                /dev/vms/test
  VG Name                vms
  LV UUID                iwn7JU-DnsL-9dPr-eBvo-gR1a-SwNJ-g7ZQEW
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                10.00 GB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/vms/windows-legacy
  VG Name                vms
  LV UUID                KSttrw-8IcL-iy1g-i0t1-eu30-Aow2-UqVAqX
  LV Write Access        read/write
  LV Status              available
  # open                 3
  LV Size                20.00 GB
  Current LE             5120
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:4

where 
/dev/vms/server2003  is not running
/dev/vms/test is ext2 and never used by xen, instead normaly mount/unmount
/dev/vms/windows-legacy is running

I am using:
app-emulation/xen-3.1.2
app-emulation/xen-tools-3.1.2
sys-fs/udev-115-r1
sys-fs/lvm2-2.02.28-r2
sys-kernel/xen-sources-2.6.20-r6


Reproducible: Always

Steps to Reproduce:
1.lvcreate -L10G -ntest vms
2.xm create test-windows
3.Shutdown Windows 
4.lvdisplay 

Actual Results:  
lvdisplay shows alway at least 1 open 

Expected Results:  
should be not open by anything

[Comment 1 Svenne Krap 2009-12-10 14:37:10 UTC]

I think I have a similar problem with snapshot LVs.

The system that uses the LVs has run for years, after update of udev and lvm2.... 

Removing LV-snapshot after use fails most of the time.