Missing lvms from iostat

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.