PV = Physical Volume الاربع البارتشنات الحقيقية
VG = Volume Group مجموعة تضم تلك البارتشنات وحجمها مجموع الاحجام
LV = Logical Volume بارتشن حقيقي يمكننا من اعادة تحجيمة بسهولة

alias block-major-58 lvm-mod
alias char-major-109 lvm-mod

[[email protected] init.d]# fdisk -l

Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot   Start       End      Blocks   Id  System
/dev/hda1   *      1         255     2048256   83  Linux
/dev/hda2         256        2805    20482875   83  Linux
/dev/hda3         2806        4080    10241437+  83  Linux
/dev/hda4         4081        9729    45375592+   5  Extended
/dev/hda5         4081        4203      987966   fd  Linux raid autodetect
/dev/hda6         4204        4326      987966   fd  Linux raid autodetect
/dev/hda7         4327        4449      987966   fd  Linux raid autodetect
/dev/hda8         4450        4572      987966   fd  Linux raid autodetect
/dev/hda9         4573        5181     4891761   83  Linux
[COLOR="Red"]/dev/hda10        5182        5304      987966   8e  Linux LVM
/dev/hda11        5305        5427      987966   8e  Linux LVM
/dev/hda12        5428        5550      987966   8e  Linux LVM
/dev/hda13        5551        5673      987966   8e  Linux LVM[/COLOR]

[[email protected] init.d]# pvcreate /dev/hda10 /dev/hda11 /dev/hda12 /dev/hda13
  Physical volume "/dev/hda10" successfully created
  Physical volume "/dev/hda11" successfully created
  Physical volume "/dev/hda12" successfully created
  Physical volume "/dev/hda13" successfully created
[[email protected] init.d]#

[[email protected] init.d]# vgcreate lvmhard /dev/hda10 /dev/hda11 /dev/hda12 /dev/hda13
  Volume group "lvmhard" successfully created
[[email protected] init.d]#

[[email protected] init.d]# lvcreate -L 1G -n lvmpart lvmhard
  Logical volume "lvmpart" created
[[email protected] init.d]#

/dev/lvmhard/lvmpart

[[email protected] init.d]# mke2fs -j /dev/lvmhard/lvmpart
mke2fs 1.35 (28-Feb-2004)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
131072 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[[email protected] init.d]#

[[email protected] ~]# mount /dev/lvmhard/lvmpart /root/lvm
[[email protected] ~]#

[[email protected] ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda2              20G  6.2G   13G  34% /
/dev/hda1             2.0G   38M  1.8G   3% /boot
/dev/hda3             9.7G   57M  9.1G   1% /home
/dev/hdc              5.0M  5.0M     0 100% /media/cdrom
/dev/md0              2.8G   37M  2.7G   2% /root/raid
[COLOR="Red"]/dev/mapper/lvmhard-lvmpart 1008M   34M  924M   4% /root/lvm[/COLOR]

[[email protected] ~]# nano /etc/fstab

/dev/lvmhard/lvmpart    /root/lvm               ext3    defaults        1 2

[[email protected] ~]# mount -a

[[email protected] ~]# lvdisplay
  --- Logical volume ---
  ....
  ....
 LV Size                1.00 GB
  ....
[[email protected] ~]#

[[email protected] ~]# lvextend -L +1G /dev/lvmhard/lvmpart
  Extending logical volume lvmpart to 2.00 GB
  Logical volume lvmpart successfully resized

[[email protected] ~]# lvreduce -L 1.5G /dev/lvmhard/lvmpart
  WARNING: Reducing active and open logical volume to 1.50 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lvmpart? [y/n]: y
  Reducing logical volume lvmpart to 1.50 GB
  Logical volume lvmpart successfully resized

[[email protected] ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/lvmhard/lvmpart
  VG Name                lvmhard
  LV UUID                34Hqdd-Yqk3-qCnv-U4bm-7WQJ-z8ba-oT2729
  LV Write Access        read/write
  LV Status              available
  # open                 1
[COLOR="Red"]  LV Size                1.50 GB[/COLOR]
  Current LE             384
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:0

ext2online -d /dev/lvmhard/lvmpart

[[email protected] ~]# [COLOR="Red"]fdisk /dev/hda[/COLOR]

The number of cylinders for this disk is set to 9729.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): [COLOR="Red"]n[/COLOR]
First cylinder (5674-9729, default 5674):
Using default value 5674
Last cylinder or +size or +sizeM or +sizeK (5674-9729, default 9729): [COLOR="Red"]+1GB[/COLOR]

Command (m for help): [COLOR="Red"]t[/COLOR]
Partition number (1-14): [COLOR="Red"]14[/COLOR]
Hex code (type L to list codes): [COLOR="Red"]8e[/COLOR]
Changed system type of partition 14 to 8e (Linux LVM)

Command (m for help): [COLOR="Red"]w[/COLOR]
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[[email protected] ~]# [COLOR="Red"]init 6[/COLOR] <-- لاعادة تشغيل الجهاز
[[email protected] ~]# [COLOR="Red"]pvcreate /dev/hda14[/COLOR]
  Physical volume "/dev/hda14" successfully created
[[email protected] ~]# [COLOR="Red"]vgextend lvmhard /dev/hda14[/COLOR]
  Volume group "lvmhard" successfully extended
[[email protected]ple ~]#

[[email protected] ~]# vgreduce lvmhard /dev/hda14
  Removed "/dev/hda14" from volume group "lvmhard"
[[email protected] ~]#