Increase the Lun size on the SAN or VM Hypervisor

dmesg | tail

    sdb: Write Protect is off
    sdb: Mode Sense: 61 00 00 00
    sdb: cache data unavailable
    sdb: assuming drive cache: write through
    sdb: detected capacity change from 214748364800 to 429496729600

[root@server ~]# pvscan
      PV /dev/sdb    VG vgdata    lvm2 [199.97 GB / 0    free]
      PV /dev/sda2   VG vgsys     lvm2 [49.75 GB / 5.81 GB free]
      Total: 2 [249.72 GB] / in use: 2 [249.72 GB] / in no VG: 0 [0   ]

[root@server ~]# pvresize  /dev/sdb
      Physical volume "/dev/sdb" changed
      1 physical volume(s) resized / 0 physical volume(s) not resized

[root@server ~]# pvs
      PV         VG      Fmt  Attr PSize   PFree
      /dev/sda2  vgsys   lvm2 a--   49.75G   5.81G
      /dev/sdb   vgdata0 lvm2 a--  399.97G 200.00G


[root@server ~]# lvextend -r -l +100%FREE /dev/vgdata/lv-data
      Extending logical volume opt_splunk_var_lib_splunk to 399.97 GB
      Logical volume opt_splunk_var_lib_splunk successfully resized
    resize4fs 1.41.12 (17-May-2010)
    Filesystem at /dev/mapper/vgdata-lvdata is mounted on /mnt/data on-line resizing required
    old desc_blocks = 13, new_desc_blocks = 25
    Performing an on-line resize of /dev/mapper/vgdata-lvdata to 104849408 (4k) blocks.
    The filesystem on /dev/mapper/vgdata-lvdata is now 104849408 blocks long.

[root@server ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vgsys-root
                           20G  3.7G   15G  20% /
    /dev/sda1             244M   49M  183M  21% /boot
    tmpfs                 1.9G     0  1.9G   0% /dev/shm
    /dev/mapper/vgdata/lvdata
                          394G  143G  232G  39% /mnt/data