LinuxQuestions.org - Extended LVM Volume group and Logical Volume. But space not usable

Hello All,

I have this server on which LVM LV is mounted on "/". This acts as a backup server and now there is need to extend the "/".
So to do it, we added one extra Hard drive and created partitions on the drive and added them to the volume group.
After this the LV was extended as well.
But the extended space is not usable and df -h does not show the extended size.
Please check below for any information

Code:

 --- Logical volume ---

  LV Name                /dev/VolGroup00/LogVol00

  VG Name                VolGroup00

  LV UUID                WEQqSc-vI5p-b3ll-GNFO-WcIf-pvMc-NV5hTo

  LV Write Access        read/write

  LV Status              available

  # open                1

  LV Size                2.73 TB

  Current LE            89358

  Segments              3

  Allocation            inherit

  Read ahead sectors    0

  Block device          253:0

Code:

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

                      901G  818G  37G  96% /

[root@backuppc2 ~]# mount

/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

devpts on /dev/pts type devpts (rw,gid=5,mode=620)

sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)