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

Solution Verified - Updated -


  • 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"
# 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?


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

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.