Linux File System Management
Here I am taken three disk for use of different different examples to manage the linux filesystem, where
the disk name is /dev/sda, /dev/sdb, /dev/sdc.
How to Create Physical Volume?
# pvcreate /dev/sdb
# pvdisplay or pvs
How to Create Physical Volume?
# pvcreate /dev/sdb
# pvdisplay or pvs
How to Create Volume Group?
# vgcreate vg0 /dev/sdb
# vgdisplay or vgs
How to Create Logical Volume?
# lvcreate –L 100M –n lv0 /dev/vg0
# lvdispaly or lvs
# mkfs.ext4 /dev/vg0/lv0
# mkdir /data
# mount /dev/vg0/lv0 /data
# df –Th
# mount –a
How to remove the logical volume, volume group, physical volume?
# umount /dev/vg0/lv0 /data
# lvremove /dev/vg0/lv0
# vgremove /dev/vg0
# pvremove /dev/sdb
How to extend the vgsize in volume group?
# vgs
# vgextend vg0 /dev/sdc
# vgs
How to reduce the vgsize in volume group?
# vgs
# vgreduce vg0 /dev/sdc
# vgs
How to extend the lvsize in logical volume?
# vgs
# df –Th /data
# lvextend –L +100M /dev/vg0/lv0
# resize2fs /dev/vg0/lv0
# df –Th /data
How to reduce the lvsize in logical volume?
# lvs
# df –Th /data
# umount /dev/vg0/lv0 /data
# e2fsck –f /dev/vg0/lv0
# resize2fs /dev/vg0/lv0 200M
# lvreduce –L -100M /dev/vg0/lv0
How to create the snapshot of logical volume?
# lsv /dev/vg0/lv0*
# lvcreate –size 200M –snapshot –name lv0_snap /dev/vg0/lv0
# lsv /dev/vg0/lv0*
# mkdir /data_snap
# mount /dev/vg0/lv0_snap /data
# df –Th /data*
How to activate and deactivate the volume group & logical volume?
# vgchange –an /dev/vg0 [deactivate vg]
# vgchange –ay /dev/vg0 [activate vg]
# umount /dev/vg0/lv0 /data
# lvchange –an /dev/vg0/lv0 [deactivate lv]
# lvchange –ay /dev/vg0/lv0 [activate lv]
# mount /dev/vg0/lv0 /data
How to create the mirror of logical volume?
# pvcreate /dev/sdb{1,2,3}
# vgcreate vg0 /dev/sdb{1,2,3}
# lvcreate –L 50M –m 1 –n lv0_mirror /dev/vg0
# mkfs /dev/vg0/lv0_mirror
# mkdir /data_mirror
# mount /dev/vg0/lv0_mirror /data_mirror
# df –Th /data_mirror
How to recover a deleted logical volume?
# lvcreate -L 100M -n lv0 /dev/vg0
# mkfs.ext4 /dev/vg0/lv0
# mkdir /data
# mount /dev/vg0/lv0 /data
# umount /dev/vg0/lv0 /data
# lvremove /dev/vg0/lv0 /data
# cd /etc/lvm/archive
# vgcfgrestore –list vg0
# vgcfgrestore -f /etc/lvm/archive/vg0_xxxxx-xxxxxxxxxx.vg vg0
# lvchange -ay /dev/vg0/lv0
# lvscan
# mount /dev/vg0/lv0 /data
