Backup all data on filesystem to be resized
Resizing a filesystem and underlying devices is dangerous and potentially destructive if performed incorrectly. Repartitioning devices is similarly destructive and may result in complete data loss. Before proceeding, backup the contents of the filesystem/device to be resized.
Resizing (extending) non-root EXT3/4 filesystem on LVM device
1. Example Setup
In this example, a Volume Group (VG) called VolGroupData of size 20Gb contains a Logical Volume (LV) called LogVolData01 of size 10Gb with an EXT3/4 filesystem (/data) utilising all space within the Logical Volume. Both the LV and EXT3/4 filesystem are resized (extended).
Before proceeding, run the following commands – record output for later use.
# fdisk -l /dev/sdb Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 2610 20964793+ 8e Linux LVM
# cat /proc/partitions | grep sdb 8 16 20971520 sdb 8 17 20964793 sdb1
# pvs PV VG Fmt Attr PSize PFree /dev/sdb1 VolGroupData lvm2 a- 19.99G 9.99G
# vgs VG #PV #LV #SN Attr VSize VFree VolGroupData 1 1 0 wz--n- 19.99G 9.99G
# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert LogVolData01 VolGroupData -wi-ao 10.00G
# df -k /dev/mapper/VolGroupData-LogVolData01
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroupData-LogVolData01
10321208 9600672 196248 98% /data 2. Unmount the filesystem
Unmount the EXT3/4 filesystem to be resized e.g.:
# umount /data
3. Perform a filesystem check
Perform a filesystem check of the resized EXT3/4 filesystem ensuring to use the corresponding filesystem check utility (fsck.ext3, fsck.ext4) for the filesystem type in use e.g.:
# blkid /dev/VolGroupData/LogVolData01 /dev/VolGroupData/LogVolData01: LABEL="/data" UUID="1fc0bbcd-ba86-40b6-b562-5da90fb0d7af" TYPE="ext3"
# fsck.ext3 -fy /dev/VolGroupData/LogVolData01 e2fsck 1.39 (29-May-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 data: 20/1294336 files (5.0% non-contiguous), 2440792/2580302 blocks
4. Resize (extend) the Logical Volume
Use the lvextend or lvresize utility to extend the Logical Volume to use available space in the Volume Group e.g.:
# lvextend -L 15G /dev/VolGroupData/LogVolData01 Extending logical volume LogVolData01 to 15.00 GB Logical volume LogVolData01 successfully resized
5. Verify Logical Volume resize
Verify Logical Volume resize e.g.:
# vgs VG #PV #LV #SN Attr VSize VFree VolGroupData 1 1 0 wz--n- 19.99G 4.99G
# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert LogVolData01 VolGroupData -wi-a- 15.00G
# lvs --units m LV VG Attr LSize Origin Snap% Move Log Copy% Convert LogVolData01 VolGroupData -wi-a- 15360.00M
6. Perform a filesystem check
Perform a filesystem check of the resized EXT3/4 filesystem ensuring to use the corresponding filesystem check utility (fsck.ext3, fsck.ext4) for the filesystem type in use e.g.:
# fsck.ext3 -fy /dev/VolGroupData/LogVolData01 e2fsck 1.39 (29-May-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 data: 20/1310720 files (5.0% non-contiguous), 2441306/2621440 blocks
7. Resize (extend) the filesystem
Use the resize2fs utility to extend the EXT3/4 filesystem to use the additional space in the Logical Volume e.g.:
# resize2fs /dev/VolGroupData/LogVolData01 resize2fs 1.39 (29-May-2006) Resizing the filesystem on /dev/VolGroupData/LogVolData01 to 3932160 (4k) blocks. The filesystem on /dev/VolGroupData/LogVolData01 is now 3932160 blocks long.
8. Mount the resized filesystem
Mount the newly EXT3/4 resized filesystem e.g.:
# mount /data
9. Verify filesystem resize
Review dmesg, messages log, df command output, etc. to verify successful EXT3/4 filesystem resize e.g.:
# df -k /dev/mapper/VolGroupData-LogVolData01
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroupData-LogVolData01
15481840 9603228 5092180 66% /data