LVM구성해보기_CentOS7

* LVM (Logical Volume Manager) - 논리 하드디스크 관리자

 

여러개의 하드디스크를 합쳐서 나누는 작업 

ex) 2개의 2TB HDD를  4TB로 합친 후 1TB, 2TB, 1TB로 나눔   

 

 

• 물리 볼륨(PV : Physical Volume) - /dev/sda1, /dev/sdb1 파티션을 뜻한다
• 볼륨 그룹(VG : Volume Group) - 물리볼륨을 합쳐서 1개의 물리 그룹으로 만든 것
• 논리 볼륨(LV : Logical Volume) - 볼륨 그룹을 1개이상으로 나눈 것 

 

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* LVM과정

1. 실습을 위해 하드디스크 2TB 2개 준비

 

#ls -l /dev/sd*
brw-rw---- 1 root disk 8, 16  9월 16 17:06 /dev/sdb
brw-rw---- 1 root disk 8, 32  9월 16 17:06 /dev/sdc
 

#물리 볼륨 생성
# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
 
# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created.
 
#볼륨 그룹 생성
# vgcreate VG /dev/sdb1 /dev/sdc1
Volume group "VG" successfully created
 
#논리 볼륨 생성
# lvcreate --size 1G --name LV1 VG
  Logical volume "LV1" created.
 
# lvcreate --size 1G --name LV2 VG
  Logical volume "LV2" created.
 
# lvcreate --extents 100%FREE --name LV3 VG
  Logical volume "LV3" created.

논리볼륨 경로

[root@localhost ~]# ls -l /dev/VG/LV*
lrwxrwxrwx 1 root root 7  9월 16 17:13 /dev/VG/LV1 -> ../dm-0
lrwxrwxrwx 1 root root 7  9월 16 17:13 /dev/VG/LV2 -> ../dm-1
lrwxrwxrwx 1 root root 7  9월 16 17:14 /dev/VG/LV3 -> ../dm-2

*파일시스템 생성

[root@localhost ~]# mkfs.ext4 /dev/VG/LV1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
65536 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
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376
 
Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
[root@localhost ~]# mkfs.ext4 /dev/VG/LV2
[root@localhost ~]# mkfs.ext4 /dev/VG/LV3

mkfs.ext4 /dev/VG/LV1~3

 

파일시스템 생성 후 마운트와 fstab에 오토마운트 등록하면 완료