21:35:04 root[pts/0]@grumpy ~# vgdisplay
  /dev/sda: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdd: read failed after 0 of 4096 at 0: Input/output error
  --- Volume group ---
  VG Name               backup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               6.00 GB
  PE Size               4.00 MB
  Total PE              1535
  Alloc PE / Size       768 / 3.00 GB
  Free  PE / Size       767 / 3.00 GB
  VG UUID               KIAO6R-BN19-SWvs-EoF0-Owqg-o2SQ-hpWOxt

  --- Volume group ---
  VG Name               sys
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.93 GB
  PE Size               4.00 MB
  Total PE              495
  Alloc PE / Size       241 / 964.00 MB
  Free  PE / Size       254 / 1016.00 MB
  VG UUID               xYm2fk-TL7y-lIlx-Z1H8-6xwe-bjYq-05YqWN