Dear all 

I did an upgrade of my Ubuntu 16.04.2 system and when I rebooted my key volume 
group won’t activate properly. If I do a pvs, vgs, or lvs all the volumes 
appear good but dmsetup doesn’t show any information

For example I do this and I see the volume (VM70POOL is the VG I am interested 
in)

  >vgs

  VG        #PV #LV #SN Attr   VSize VFree 
  VM70POOL    1  11   0 wz--n- 1.82t  1.08t
  ubuntu-vg   2   2   0 wz--n- 3.64t 48.19g

and
root@vmhost:/var/log# lvdisplay /dev/VM70POOL/health-root-1610 
  --- Logical volume ---
  LV Path                /dev/VM70POOL/health-root-1610
  LV Name                health-root-1610
  VG Name                VM70POOL
  LV UUID                jVkRfy-tQ6M-D9RM-xcvO-NxGX-24RY-jQv1r1
  LV Write Access        read/write
  LV Creation host, time vmhost, 2016-11-16 10:10:58 +0200
  LV Status              NOT available
  LV Size                64.00 GiB
  Current LE             16384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto


But I can’t activate the volume — I get 

root@vmhost:/var/log# vgchange -ay VM70POOL 
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  device-mapper: reload ioctl on (252:6) failed: Device or resource busy
  0 logical volume(s) in volume group "VM70POOL" now active

and in kern.log we have  "kernel: [ 3819.113149] device-mapper: table: 252:6: 
linear: Device lookup failed"

Indeed there is no /dev/dm-6 or above

and dmsetup ls shows no sign of the volume
root@vmhost:/var/log#  dmsetup ls --tree -o device
ubuntu--vg-swap_1 (252:5)
 └─ (8:5)
ubuntu--vg-root (252:4)
 ├─ubuntu--vg-root_rimage_1 (252:3)
 │  └─ (8:21)
 ├─ubuntu--vg-root_rmeta_1 (252:2)
 │  └─ (8:21)
 ├─ubuntu--vg-root_rimage_0 (252:1)
 │  └─ (8:5)
 └─ubuntu--vg-root_rmeta_0 (252:0)
    └─ (8:5)



For the record 
root@vmhost:/var/log#root@vmhost:/var/log# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdc
  VG Name               VM70POOL
  PV Size               1.82 TiB / not usable 1.09 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              476932
  Free PE               284420
  Allocated PE          192512
  PV UUID               X2Pzgr-nqNp-ri8n-HoT6-Zs7y-e7FC-sNURM6




smartmon shows no problem with the disk though I realize that doesn’t 
necessarily mean anything


FWIW, in one posting I found that someone with a similar problem had there was 
a suggestion to do vgscan —mknodes
This had no effect.

I have rebooted the machine too 

Any suggestions gratefully received?

Many thanks

Scott






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