ext3 Partition 6GB less than underlying logical volume even after resizing using resize2fs

Hi,

I got a Server Installed with LVM by a third party.

the /var/www is on LV /dev/vg1/www

df -h Shows /var/www is only 394 GB
whereas lvdisplay shows /dev/vg1/www to be 400 GB

======================================================================
websrv-1:/var/www# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 1.9G 139M 1.7G 8% /
tmpfs 2.0G 0 2.0G 0% /lib/init/rw
udev 10M 40K 10M 1% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sda1 274M 24M 237M 9% /boot
/dev/mapper/vg1-home 2.0G 33M 2.0G 2% /home
/dev/mapper/vg1-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg1-usr 5.0G 265M 4.8G 6% /usr
/dev/mapper/vg1-var 10G 190M 9.9G 2% /var
/dev/mapper/vg1-log 31G 45M 31G 1% /var/log
/dev/mapper/vg1-www 394G 199M 374G 1% /var/www
websrv-1:/var/www# lvdisplay /dev/vg1/www
--- Logical volume ---
LV Name /dev/vg1/www
VG Name vg1
LV UUID qEaBfH-1fg5-f7Qg-VHfZ-azNM-beaf-vNbljL
LV Write Access read/write
LV Status available
# open 1
LV Size 400.00 GB
Current LE 102400
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 254:6
===================================================================

I extended the LV /dev/vg1/www to +5GB and resized the ext3 partition again.
Still the File System is 6GB less than the LV below it.

ReiserFS Logical Volumes shows no problems By the way.

Could Some one please explain why this is the case with ext3 File System?

Also is the JFS 2.6 kernel BUG mentioned the the URL below fixed in
the current kernel for Etch?
http://tldp.org/HOWTO/LVM-HOWTO/extendlv.html

Just thinking if I should switch to JFS from ext3 since it can be
extended while it is online and not disrupt the webserver running.
Since it is also fast and does not have the XFS problems of unclean
unmounts due power failures and so on.
===========================================================================
websrv-1:/var/www# lvextend -L405G /dev/vg1/www
Extending logical volume www to 405.00 GB
Logical volume www successfully resized
websrv-1:/var/www# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 1.9G 139M 1.7G 8% /
tmpfs 2.0G 0 2.0G 0% /lib/init/rw
udev 10M 40K 10M 1% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sda1 274M 24M 237M 9% /boot
/dev/mapper/vg1-home 2.0G 33M 2.0G 2% /home
/dev/mapper/vg1-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg1-usr 5.0G 265M 4.8G 6% /usr
/dev/mapper/vg1-var 10G 190M 9.9G 2% /var
/dev/mapper/vg1-log 31G 45M 31G 1% /var/log
/dev/mapper/vg1-www 394G 199M 374G 1% /var/www
websrv-1:/var/www# cd /
websrv-1:/# umount /var/www/
websrv-1:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 1.9G 139M 1.7G 8% /
tmpfs 2.0G 0 2.0G 0% /lib/init/rw
udev 10M 40K 10M 1% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sda1 274M 24M 237M 9% /boot
/dev/mapper/vg1-home 2.0G 33M 2.0G 2% /home
/dev/mapper/vg1-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg1-usr 5.0G 265M 4.8G 6% /usr
/dev/mapper/vg1-var 10G 190M 9.9G 2% /var
/dev/mapper/vg1-log 31G 45M 31G 1% /var/log

websrv-1:/# e2fsck -f /dev/vg1/www
e2fsck 1.40-WIP (14-Nov-2006)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/vg1/www: 19/52428800 files (5.3% non-contiguous), 1696065/104857600 blocks
websrv-1:/# resize2fs /dev/vg1/www
resize2fs 1.40-WIP (14-Nov-2006)
Resizing the filesystem on /dev/vg1/www to 106168320 (4k) blocks.
The filesystem on /dev/vg1/www is now 106168320 blocks long.

websrv-1:/#
websrv-1:/# mount /var/www
websrv-1:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 1.9G 139M 1.7G 8% /
tmpfs 2.0G 0 2.0G 0% /lib/init/rw
udev 10M 40K 10M 1% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sda1 274M 24M 237M 9% /boot
/dev/mapper/vg1-home 2.0G 33M 2.0G 2% /home
/dev/mapper/vg1-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg1-usr 5.0G 265M 4.8G 6% /usr
/dev/mapper/vg1-var 10G 190M 9.9G 2% /var
/dev/mapper/vg1-log 31G 45M 31G 1% /var/log
/dev/mapper/vg1-www 399G 199M 379G 1% /var/www
websrv-1:/# lvdisplay /dev/vg1/www
--- Logical volume ---
LV Name /dev/vg1/www
VG Name vg1
LV UUID qEaBfH-1fg5-f7Qg-VHfZ-azNM-beaf-vNbljL
LV Write Access read/write
LV Status available
# open 1
LV Size 405.00 GB
Current LE 103680
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 254:6
=========================================================================

Thankyou So much :-)

Kind Regards

Siju


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