EXAMPLES

Setting up LVM on three SCSI disks (/dev/sda, /dev/sdb, and /dev/sdc) with striping   

  • Preparing the disks

    # pvcreate /dev/sda 

# pvcreate /dev/sdb 

# pvcreate /dev/sdc

  • Setup a VG

    1. Create a VG

      # vgcreate my_VG /dev/sda /dev/sdb /dev/sdc

    2. Run # vgdisplay to verify volume group

  • Creating the LV (1GB) with 3 PVs and strip size of 4 KB on the VG:

    # lvcreate -i3 -I4 -L1G -nmy_LV my_VG

  • Creating an ext4 file system on the LV

    # mke4fs /dev/my_VG/my_LV

  • Mount and Test the File System

    # mount /dev/my_VG/my_LV /mnt 

# df

Snapshot

  1. Creating a snapshot of an entire LV:

    # lvdisplay my_LV | grep "LV Size" 

	LV Size	50.00 GiB 

# lvcreate -L50G -s -nmy_LV_backup  /dev/my_VG/my_LV

  2. Mount the snapshot volume:

    # mkdir /mnt/my_LV_backup 

# mount /dev/my_VG/my_LV_backup /mnt/my_LV_backup

  3. Remove the snapshot:

    # umount /mnt/my_LV_backup

# lvremove /dev/my_VG/my_LV_backup

Removing an Old Disk (/dev/sdb)

  1. Distributing Old Extents to Existing Disks in VG

    # pvmove /dev/sdb

  2. Remove the unused disk

    # vgreduce my_VG /dev/sdb

  3. The drive can now be removed when the machine is powered down

Replace an old disc (/dev/sdb) with a new one (/dev/sdf)

  1. Preparing the new disk

    # pvcreate /dev/sdf

  2. Add it to the VG my_VG

    # vgextend my_VG /dev/sdf

  3. Moving the data

    # pvmove /dev/sdb /dev/sdf

  4. Removing the unused disk

    # vgreduce my_VG /dev/sdb

  5. The drive can now be removed when the machine is powered down