Missing lvms from iostat

Solution Unverified - Updated -

Issue

  • We don't see a complete list of logical volumes in out output of iostat -N
  • In some systems it works fine, and on others we don't see a complete list of lv's
  • I am using iostat –N to get LVM stats and I noticed that on some systems it does not display some logical volumes.
  • Details:
# dmsetup ls |grep vg00
vg00-lv_swap    (253:0)
vg00-lv_root    (253:1)
vg00-lv_shared  (253:11)
vg00-lv_mine    (253:12)


# iostat -N |grep vg00
vg00-lv_swap      0.00         0.00         0.00       5192          0
vg00-lv_root      0.61        13.32         3.36   16052522    4047256
vg00-lv_shared    18.91        14.71       150.50   17719042  181311008
vg00-lv_mine      0.00         0.00         0.00       3480          0


  • Some vg00 logical volumes missing from iostat - only vg00-lv_shared shows up
# dmsetup ls |grep vg00
vg00-lv_swap    (253:0)
vg00-lv_root    (253:1)
vg00-lv_shared  (253:66)

# iostat -N |grep vg00
vg00-lv_shared   160.41        64.12      1272.83  133389890 2647798792
  • All vg00 logical volumes missing from iostat
# dmsetup ls |grep vg00
vg00-lv_swap    (253:0)
vg00-lv_root    (253:1)
vg00-lv_shared  (253:149)

# iostat -N | grep vg00
#
  • The main difference between the working and non working system appears to be number of devices.

Environment

  • Red Hat Enterprise Linux 6.8
  • lvm
  • sysstat
  • iostat

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