Stefan Seelmann

LVM

General LVM usage.

Shrink a logical volumne

Unmount and check the filesystem:

# umount /foo
# e2fsck -f /dev/mapper/vg-foo

Resize the filesystem and the logical volumne, perform a filesystem check to see if it fits into the logical volumne:

# resize2fs -p /dev/mapper/vg-foo 4G
# lvreduce -L 4G /dev/mapper/vg-foo
# e2fsck -f /dev/mapper/vg-foo

Resize the filesystem to match the logical volumne size:

# resize2fs -p /dev/mapper/vg-foo
# e2fsck -f /dev/mapper/vg-foo

Mount the filesystem:

# mount /foo

Extend a logical volumne online

# e2fsck -f /dev/mapper/vg-foo
# lvresize -L 10G /dev/mapper/vg-foo
# resize2fs /dev/mapper/vg-foo
# e2fsck -f /dev/mapper/vg-foo

Create a new physical volumne

# pvcreate /dev/sdXY

Create a new volumne group

# vgcreate vg01 /dev/sdXY

Create a new logical volumne

Create logical volumne and filesystem:

# lvcreate -L 8G -n foo vg
# mkfs.ext4 /dev/mapper/vg-foo

Add to /etc/fstab:

/dev/mapper/vg-foo   /foo          ext4  defaults  0  2

Mount:

# mount /foo

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