Suppose if you want to extend the filesystem by another 400mb then follow below steps:
1. Extend the LV first using below command.
[root@mann ~]# lvextend -L +400 /dev/myvg/lvol0
Extending logical volume lvol0 to 600.00 MiB
Logical volume lvol0 successfully resized
2. Now resize the lv using resize2fs command.
[root@mann ~]# resize2fs /dev/myvg/lvol0
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/myvg/lvol0 is mounted on /test; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 3
Performing an on-line resize of /dev/myvg/lvol0 to 614400 (1k) blocks.
The filesystem on /dev/myvg/lvol0 is now 614400 blocks long.
3.Now check whether the mountpoint extended or not using df -h
[root@mann ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 16G 2.0G 13G 14% /
tmpfs 1012M 0 1012M 0% /dev/shm
/dev/sda1 291M 29M 248M 11% /boot
/dev/mapper/myvg-lvol0
582M 6.3M 575M 2% /test
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The Above output states that mountpoint is now extended by 400MB.
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