How To Create Linux LVM In 3 Minutes

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                转载自：http://www.walkernews.net/2007/07/02/how-to-create-linux-lvm-in-3-minutes/

How To Create Linux LVM In 3 Minutes
          Copyright ©
Walker
02 Jul 2007 23:22
   
      What’s LVM? Why using Linux Logical Volume Manager or LVM?
These questions are not the scope here. But in brief, the most
attractive feature of Logical Volume Manager is to make disk management
easier in Linux! Basically, LVM allows users to dynamically extend or
shrink Linux “partition” or file system in online mode! The
LVM can resize volume groups (VG) online
by adding new physical volumes (PV) or rejecting those existing PVs attached to VG.

A visualized concept diagram of the Linux Logical Volume Manager or LVM
In this 3-minutes Linux LVM guide, let’s assume that

• The LVM is not currently configured or in used. Having say that,
  this is the LVM tutorial if you’re going to setup LVM from the ground
  up on a production Linux server with a new
  SATA
  / SCSI hard disk.
  
• Without a luxury server hardware, I tested this LVM tutorial on PC
  with the secondary hard disk dedicated for LVM setup. So, the Linux dev
  file of secondary IDE hard disk will be /dev/hdb (or /dev/sdb for SCSI
  hard disk).
  
• This guide is fully tested in Red Hat Enterprise Linux 4 with
  Logical Volume Manager 2 (LVM2) run-time environment (LVM version
  2.00.31 2004-12-12, Library version 1.00.19-ioctl 2004-07-03, Driver
  version 4.1.0)!

How to setup Linux LVM in 3 minutes at command line?

Login with root user ID and try to avoid
using sudo command
for simplicity reason.

Using the whole secondary hard disk for LVM partition:
fdisk /dev/hdb
At the Linux fdisk command prompt,

press n to create a new disk partition,

press p to create a primary disk partition,

press 1 to denote it as 1st disk partition,

press ENTER twice to accept the default of 1st and last cylinder – to convert the whole secondary hard disk to a single disk partition,

press t (will automatically select the only partition
– partition 1) to change the default Linux partition type (0×83) to LVM
partition type (0×8e),

press L to list all the currently supported partition type,

press 8e (as per the L listing) to change partition 1 to 8e, i.e. Linux LVM partition type,

press p to display the secondary hard disk partition setup. Please take note that the first partition is denoted as /dev/hdb1 in Linux,

press w to write the partition table and exit fdisk upon completion.

Next, this LVM command will create a LVM physical volume (PV) on a regular hard disk or partition:
pvcreate /dev/hdb1

Now, another LVM command to create a LVM volume group (VG) called vg0 with a physical extent size (PE size) of 16MB:
vgcreate -s 16M vg0 /dev/hdb1
Be
properly planning ahead of PE size before creating a volume group with vgcreate -s
option!

Create a 400MB logical volume (LV) called lvol0 on volume group vg0:
lvcreate -L 400M -n lvol0 vg0
This lvcreate command will create a softlink /dev/vg0/lvol0 point
to a correspondence block device file called /dev/mapper/vg0-lvol0.

The Linux LVM setup is almost done. Now is the time to format
logical volume lvol0 to create a Red Hat Linux supported file system,
i.e. EXT3 file system, with 1%
reserved block count
:
mkfs -t ext3 -m 1 -v /dev/vg0/lvol0

Create a mount point before mounting the new EXT3 file system:
mkdir /mnt/vfs

The last step of this LVM tutorial – mount the new EXT3 file system
created on logical volume lvol0 of LVM to /mnt/vfs mount point:
mount -t ext3 /dev/vg0/lvol0 /mnt/vfs
To confirm the LVM setup has been completed successfully, the df -h command should display these similar message:
/dev/mapper/vg0-lvol0 388M   11M  374M   3% /mnt/vfs
               
               
               
               
               

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