[linux-lvm] File system size difference betwen lvdisplay & df -h

[Dayanand Math]

Hi,

The following df -h & lvdisplay shows the discrpancy..What could be the
reson?
I am referring to the discrepancy between LV Size in lvdisplay &  total
size df -h output of the corresponding file system.

 df -h /test
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg00-lv_test
                      124M   11M  107M   9% /test

# lvdisplay -v /dev/vg00/lv_test
    Using logical volume(s) on command line
  --- Logical volume ---
  LV Name                /dev/vg00/lv_test
  VG Name                vg00
  LV UUID                t9RjGa-hKR3-AQmA-sLqD-4PaI-fkJ3-99c1dx
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                128.00 MB
  Current LE             4
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:3


# df -h /home
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg00-lv_home
                     1008M   37M  921M   4% /home

# lvdisplay -v /dev/vg00/lv_home
    Using logical volume(s) on command line
  --- Logical volume ---
  LV Name                /dev/vg00/lv_home
  VG Name                vg00
  LV UUID                1wlyyE-RFID-0Dbi-DES8-lrDk-GLlB-6wpEBZ
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.00 GB
  Current LE             32
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1
Regs,
DM


On 2/17/09, Bryn M. Reeves <bmr at redhat.com> wrote:
>
> Dayanand Math wrote:
>
>> Hi,
>>
>> I am observing the file system size difference between df -h & lvdisplay
>> output for the systems with RHEL 4 (update 3 & 6). Its showing the
>> discrepancy in size between lvdisplay & df -h , If lvsize is less than 1GB
>> .. Is there any specific reason for that..
>>
>> Regs, DM
>>
>
> You don't tell us what the discrepancy is or give an example, so it's
> hard to make any useful suggestions.
>
> Can you provide sample command output that shows the discrepancy you
> are referring to?
>
> Regards,
> Bryn.
>
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