This is how to do a simple file system increase in Logical Volume Manager. For example, increasing /tmp from 512 Mb to 1 Gb.
/tmp is a logical volume:
# df -h /tmp Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg00-tmpvol 496M 19M 452M 4% /tmp
Running “vgdisplay /dev/vg00” showed that volume group vg00 contained 3.5 Gb of free space. Extended the logical volume with lvextend:
# lvextend -L +512m /dev/mapper/vg00-tmpvol Extending logical volume tmpvol to 1.00 GB Logical volume tmpvol successfully resized
Then resized the file system inside it with resize2fs. Resize2fs handles ext2 and ext3 file systems (and ext4 where that is available).
# resize2fs /dev/mapper/vg00-tmpvol resize2fs 1.39 (29-May-2006) Filesystem at /dev/mapper/vg00-tmpvol is mounted on /tmp; on-line resizing required Performing an on-line resize of /dev/mapper/vg00-tmpvol to 1048576 (1k) blocks. The filesystem on /dev/mapper/vg00-tmpvol is now 1048576 blocks long.
Df now reports the new file system size:
# df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg00-tmpvol 1015496 19352 943754 3% /tmp
resize2fs supersedes the older and inferior ext2online, which has been removed in Red Hat 5 onwards.