Issue

• vgchange may not be able to fully deactivate all maps of mirrored LVs when there are many mirrored LVs active:

[root@localhost disks]# vgchange -an mirrors ; lvs -a mirrors
  0 logical volume(s) in volume group "mirrors" now active
  LV                      VG      Attr   LSize   Origin Snap%  Move Log          Copy%  Convert
[...]
  mirror4                 mirrors mwi---  52.00M                    mirror4_mlog               
  [mirror4_mimage_0]      mirrors Iwi-a-  52.00M                                               
  [mirror4_mimage_1]      mirrors Iwi-a-  52.00M                                               
  [mirror4_mlog]          mirrors mwi-a-   4.00M                                 100.00        
  [mirror4_mlog_mimage_0] mirrors iwi-ao   4.00M                                               
  [mirror4_mlog_mimage_1] mirrors iwi-ao   4.00M                                               
  mirror5                 mirrors mwi---  52.00M                    mirror5_mlog               
  [mirror5_mimage_0]      mirrors Iwi-a-  52.00M                                               
  [mirror5_mimage_1]      mirrors Iwi-a-  52.00M                                               
  [mirror5_mlog]          mirrors mwi-a-   4.00M                                 100.00        
  [mirror5_mlog_mimage_0] mirrors iwi-ao   4.00M                                               
  [mirror5_mlog_mimage_1] mirrors iwi-ao   4.00M 

[root@localhost disks]# dmsetup table | grep "^mirrors"
mirrors-mirror4_mlog: 0 8192 mirror core 2 1024 block_on_error 2 252:260 0 252:261 0
mirrors-mirror5_mlog_mimage_0: 0 8192 linear 7:3 33152
mirrors-mirror5_mimage_1: 0 106496 linear 7:1 524672
mirrors-mirror5_mimage_0: 0 106496 linear 7:0 524672
mirrors-mirror5_mlog: 0 8192 mirror core 2 1024 block_on_error 2 252:296 0 252:297 0
mirrors-mirror4_mlog_mimage_1: 0 8192 linear 7:4 24960
mirrors-mirror4_mimage_1: 0 106496 linear 7:1 418176
mirrors-mirror4_mlog_mimage_0: 0 8192 linear 7:3 24960
mirrors-mirror4_mimage_0: 0 106496 linear 7:0 418176
mirrors-mirror5_mlog_mimage_1: 0 8192 linear 7:4 33152

• In the example above : although the main LVs (the one that is supposed to be used, mirror4 and mirror5) have been removed, not all the underlying maps (mirror legs and logs) remain active.

• In a High Availability environment (HA-LVM, tag based or clvmd based), this leads to rgmanager failure when attempting to deactivate the resource:

lvm[21268]: No longer monitoring mirror device mirrors-mirror4_mlog for events.
multipathd: dm-127: devmap not registered, can't remove
lvm[21268]: dm_task_run failed, errno = 6, No such device or address 
multipathd: dm-138: remove map (uevent)
lvm[21268]: mirrors-mirror4 disappeared, detaching
multipathd: dm-138: devmap not registered, can't remove
lvm[21268]: No longer monitoring mirror device mirrors-mirror4 for events.
clurgmgrd: [10593]: <err> Logical volume mirrors/ failed to shutdown
clurgmgrd[10593]: <notice> stop on lvm "HALVM" returned 1 (generic error)
clurgmgrd: [10593]: <info> unmounting /mnt/share

The typical failure has the particularity NOT to show the failed LV, but an empty name in place of the LV, thus only the VG is shown:

<err> Logical volume mirrors/ failed to shutdown