Linux Resize LUN Without Reboot

Try running following commands

Check OS using what devices for attached LUNs:

multipath -l

mpath5 (360060.......................) dm-15

[size=100G][features=1 queue_if_no_path][hwhandler=1 emc][rw]

\_ round-robin 0 [prio=0][active]

 \_ 1:0:0:14 sdb 66:192 [active][undef]

 \_ 0:0:0:14 sdc  8:224  [active][undef]

\_ round-robin 0 [prio=0][enabled]

 \_ 0:0:1:14 sdd 66:112 [active][undef]

 \_ 1:0:1:14 sde 67:176 [active][undef]

Rescan all paths:

echo 1 > /sys/block/sdb/device/rescan

echo 1 > /sys/block/sdc/device/rescan

echo 1 > /sys/block/sdd/device/rescan

echo 1 > /sys/block/sde/device/rescan

Then run:

       
partprobe

multipathd -k

resize map mpath5

If LVM is used, also required following:

#pvscan

Check Disk Changes detected under LVM:

#pvs

#vgscan

  Check VG Size is Increased:

#vgs

Now Extend the LV: 

#lvextend -L +G

Finally Extend the File System

#resize2fs

Thats it!!!