21:29:30 root[pts/0]@grumpy ~# pvdisplay
  /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
  --- Physical volume ---
  PV Name               /dev/sdc
  VG Name               backup
  PV Size               6.00 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              1535
  Free PE               767
  Allocated PE          768
  PV UUID               lIbfUN-ysId-civl-giXh-Ssmw-5WJr-wrMohK

  --- Physical volume ---
  PV Name               /dev/sdb2
  VG Name               sys
  PV Size               1.93 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              495
  Free PE               254
  Allocated PE          241
  PV UUID               kZyBLg-G7xr-NxuS-kLjf-KO2X-xgDZ-f1Y35x