목차

LVM 설정예제 2

Demonstration

  1. Start by looking at our existing disks 
    cat /proc/scsi/
dmesg |grep sd
  2. Next, partition the new disks using fdisk 
    fdisk /dev/sdb
    1. p to Print the existing table (should be blank)
    2. n to create a new partition
    3. t to change partition system ID to 8e (Linux LVM)
    4. w to write new table to disk
  3. Repeat for /dev/sdc
  4. Create the physical volumes 
    pvcreate /dev/sdb1
pvcreate /dev/sdc1
  5. NOTE: You can create multiple PVs on a single disk, but it is not recommended. Show existing Physical Volumes 
    pvscan
  6. Show Volume Groups 
    vgscan (should return nothing)
  7. Create a Volume Group from the Physical Volumes 
    vgcreate opt_vg /dev/sdb1 /dev/sdc1
  8. NOTE: You can specify PE size in vgcreate. Default is 4M. You'd use larger PE sizes for LVs greater than 256G. 65K PEs per LV.
  9. Show Volume Groups 
    vgscan (now shows the VG we created)
  10. Display information about the VG 
    vgdisplay
  11. Create a Logical Volume within the VG 
    lvcreate -l num_of_extents -n opt_lv opt_vg
lvcreate -L 100M -n opt_lv opt_vg
lvcreate -L 100M -n opt_lv -i num_stripes opt_vg
lvcreate -L 100M -n opt_lv opt_vg [PhysicalVolumePath]
  12. Display information about the LV 
    lvdisplay
lvdisplay -m (Show maps. Compare striped vs un-striped)
  13. Create a mount point 
    mkdir /opt/foo1
mkdir /opt/striped
  14. Create a filesystem 
    mkfs.ext3 /dev/opt_vg/opt_lv
mkfs.ext3 /dev/opt_vg/striped_lv
  15. Mount the filesystems 
    mount /dev/opt_vg/opt_lv
df -h

Growing a Filesystem

Grow an EXT2/3 filesystem (with unmount)

  1. Unmount the FS 
    umount /mnt/lvm_filesystem
  2. Extend the LV 
    lvresize -l +50 /dev/opt_vg/opt_lv
lvresize -L +200M /dev/opt_vg/opt_lv
fsck the filesystem 
e2fsck -f /dev/opt_vg/opt_lv
  3. Resize the filesystem 
    resize2fs /dev/opt_vg/opt_lv
  4. Remount the filesystem 
    mount -t ext3 /dev/opt_vg/opt_lv /mnt/lvm_filesystem

Grow an EXT2/3 filesystem (without unmount)

  1. Extend the LV 
    lvresize -l +50 /dev/opt_vg/opt_lv
lvresize -L +200M /dev/opt_vg/opt_lv
  2. Grow the filesystem 
    ext2online /mnt/lvm_filesystem (using mount path)
ext2online /dev/opt_vg/opt_lv (using device)

Grow a ReiserFS filesystem

  1. Create a ReiserFS on /dev/opt_vg/striped_lv 
    mkreiserfs /dev/opt_vg/striped_lv
  2. Mount the FS 
    df -h
lvresize -L +50M /dev/opt_vg/striped_lv
resize_reiserfs -f /dev/opt_vg/striped_lv
df -h
  3. Add a Physical Volume to a VG 
    vgextend vgname /path/to/PV