How to increase size of a file system ?

STEP 1. Check the file system

# df -hT

Filesystem    Type    Size  Used Avail Use% Mounted on

/dev/mapper/rootvg-root_lv

              ext4   1008M  229M  728M  24% /

tmpfs        tmpfs    499M     0  499M   0% /dev/shm

/dev/sda1     ext4    248M   32M  204M  14% /boot

/dev/mapper/rootvg-home_lv

              ext4   1008M   45M  913M   5% /home

/dev/mapper/infravg-images_lv

              ext4    2.0G  1.2G  730M  62% /images

/dev/mapper/rootvg-opt_lv

              ext4    504M   61M  418M  13% /opt

/dev/mapper/rootvg-system_lv

              ext4    124M   11M  107M  10% /system

/dev/mapper/rootvg-tmp_lv

              ext4   1008M  139M  819M  15% /tmp

/dev/mapper/rootvg-usr_lv

              ext4    2.0G  787M  1.2G  42% /usr

STEP 2. Identify the File system for which, the size to be increased

For example, You need to increase the space for /dev/mapper/rootvg-opt_lv by adding additional space of 1 GB.

STEP 3. Run following command to increase space for a file system :

# lvextend -L +1G /dev/mapper/rootvg-opt_lv

Syntax : # lvextend -L +SIZE FILESYSTEM

STEP 4. Resize the partition

# resize_reiserfs /dev/mapper/rootvg-opt_lv

OR

# ext2online -d -v /dev/mapper/rootvg-opt_lv

OR

# resize2fs -p /dev/mapper/rootvg-opt_lv

Check the file system again

# df -hT

/dev/mapper/rootvg-opt_lv

              ext4    1.5G   61M  1.4G   5% /opt

Extending the size of logical volume

# df -hT

/dev/mapper/rootvg-opt_lv

              ext4    504M  250M  229M  53% /opt

SUCCESSFULLY DONE WITH FOLLOWING COMMANDS :

# lvextend -L +500M /dev/mapper/rootvg-opt_lv

# resize2fs -p /dev/mapper/rootvg-opt_lv

AFTER

# df -hT

/dev/mapper/rootvg-opt_lv

              ext4   1008M  251M  706M  27% /opt