Why 'multipathd -k"resize map multipath_device"' is failing to resize the map?

Solution Verified - Updated -

Issue

  • After extending the size of volume from 100gb to 300gb from SAN. Issued the following commands:
# multipath -l
mpatha (360a9800064716863476f7350324a7478) dm-8 COMPELNT,Compellent Vol
[size=100G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:3 sdg 8:96  [active][undef]
 \_ 1:0:1:3 sdl 8:176 [active][undef]
# echo 1 > /sys/block/sdg/device/rescan
# multipathd -k"resize map mpatha"
fail
# resize2fs -p /dev/mapper/mpatha
resize2fs 1.39 (29-May-2006)
The filesystem is already 13107200 blocks long.  Nothing to do!
# df -h /data
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/mpatha     100G   56G   40G  59% /app
  • Had to reboot to expand mpatha. This is supposed to be done "on-the-fly". Any reason?

Environment

  • Red Hat Enterprise Linux 5 & 6
  • LUN mounted from SAN
  • Device Mapper Multipath(DM Multipath)

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