The LINUX LVM uses __linux

Linux in the maintenance process, often encounter disk space full situation, if the original disk planning is not handled well, processing disk space full of problems will be a more troublesome problem, when the system is installed directly to do disk partition mount, not using LVM (Logical Volume Manager) Managing disks, when disk space is full, and the need to migrate files from a disk full of space to a newly added disk after a new addition, is a lengthy process, especially for a very important machine for production tasks, which is a very difficult task to complete.

If the installation system was using LVM to manage the disks, it would be a very easy task to handle the problem of full disk space. Here's a quick overview of how LVM manages the disk, and for the newly added hard drive

The first step runs the command fdisk command, partitioning the disk,

Command (M for help): N  # # NEW

Command actione EXTENDEDP Primary partition (1-4) p   # # Primary Partition

Partition number (1-4): 1 # # code

Cylinder (1-1044, default 1): # # Carriage return with default 1

Last cylinder, +cylinders or +size{k,m,g} (1-1044, default 1044): # # Size Direct return

The second step is to change the type of partition you just created, and the normal LVM type is 8e

Command (M for help): t # # Change Type

Selected partition 1

Hex code (type L to list codes): 8e # # LVM partition codes

Changed system type of partition 1 to 8e (Linux LVM)

step three, create PV

Pvcreate/dev/sdb1

After successful creation, use Pvdisplay to view

---NEW physical volume---

PV NAME/DEV/SDB1

VG Name

PV Size 1.01 GiB

Allocatable NO

PE Size 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID jszvzz-ena2-g5pd-irhv-t9wi-zfa3-0xo092

Step Fourth Create a VG

Vgcreate VG-WWW/DEV/SDB1 The first parameter vg-www is the name of VG, this can be arbitrarily named, easy to remember, the second parameter/dev/sdb1, is the name of PV,

After the creation is complete, you can use Vgdisplay to view

---Volume Group---

VG Name vg-www

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 1

VG Access Read/write

VG Status resizable

MAX LV 0

Cur LV 0

Open LV 0

Max PV 0

Cur PV 1

ACT PV 1

VG Size 1.01 GiB

PE Size 4.00 MiB

Total PE 258

Alloc pe/size 0/0

Free Pe/size 258/1.01 GiB

VG UUID BWD2PS-FKAZ-LGVZ-QC7C-TAKV-FFUC-IZGNBK

Step fifth Create LV

Lvcreate-l 1g-n lv-www vg-www

The first argument-L is the amount of space to create the LV, and-N is the name of the LV, and the last Vg-www is the name of the VG

After the creation is complete, use the command lvdisplay to view

# Lvdisplay

--- Logical volume ---lv name                 /dev/vg-www/lv-www vg name                 vg-www lv uuid                 YNQ1AA-QVT1-HEJ6-ARJX-I1Q4-Y1H1-OFETLW LV  Write access        read/write LV Status               available# open                  0 LV Size                 1000.00 mib Current LE              25 Segments       &nBsp;        1 allocation              inherit read ahead sectors     auto-   CURRENTLY SET TO     256 block device    
        253:2

The sixth step, the creation of a good LV file system format, after the format is completed, you can use the partition, Mount

Mkfs.ext4/dev/vg-www/lv-www

Seventh Step: use LV

Mount/dev/vg-www/lv-www/www

Through the steps above, the LVM management of the new disk is completed, and the relationship between the PV VG LV in the process of using the following diagram