On every reboot "df" reports wrong filesystem size.

Issue

• On every reboot df reports wrong filesystem size.

# df -P /apps/mysql/db
Filesystem         1024-blocks      Used Available Capacity Mounted on
/dev/mapper/vg02-lvol5   1032088     55528    924132       6% /apps/mysql/db

• Actual size of logical volume is 20GB.

lvdisplay /dev/mapper/vg02-lvol5
  --- Logical volume ---
  LV Path                /dev/vg02/lvol5
  LV Name                lvol5
  VG Name                vg02
  LV UUID                psh3Iu-hSE1-wdrC-y2ZO-e7P4-M96F-0hcU34
  LV Write Access        read/write
  LV Creation host, time newhost, 2013-12-12 16:07:46 +0100
  LV Status              available
  # open                 1
  LV Size                20.00 GiB
  Current LE             5120
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:9

• After umount and remount df reports correct filesystem size.