Centos7 LVM root 용량 증설 하는 방법

가상머신에서 OS 운영 하다보면 disk 용량이 부족한 경우가 발생 한다.

LVM 파티션으로 설치 했다면 디스크 추가 없이 용량 증설이 가능하다.

 

30GB disk를 50GB 증설 완료

 - 기존 root 파티션에는 26GB 잡혀 있다.

 

[root@localhost ~]# fdisk -l
Disk /dev/xvda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b3de1

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *        2048     2099199     1048576   83  Linux
/dev/xvda2         2099200    62914559    30407680   8e  Linux LVM

Disk /dev/mapper/centos-root: 27.9 GB, 27913093120 bytes, 54517760 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

 

[root@localhost ~]# df -Th
Filesystem                   Type      Size  Used Avail Use% Mounted on
devtmpfs                     devtmpfs  3.8G     0  3.8G   0% /dev
tmpfs                        tmpfs     3.9G     0  3.9G   0% /dev/shm
tmpfs                        tmpfs     3.9G  9.6M  3.9G   1% /run
tmpfs                        tmpfs     3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root      xfs        26G  7.7G   19G  30% /
/dev/xvda1                   xfs      1014M  202M  813M  20% /boot
tmpfs                        tmpfs     781M   28K  781M   1% /run/user/1000
tmpfs                        tmpfs     781M     0  781M   0% /run/user/0

 

• 파티션 생성

[root@localhost ~]# fdisk  /dev/xvda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p):
Using default response p
Partition number (3,4, default 3): 3
First sector (62914560-104857599, default 62914560):
Using default value 62914560
Last sector, +sectors or +size{K,M,G} (62914560-104857599, default 104857599):
Using default value 104857599
Partition 3 of type Linux and of size 20 GiB is set

• 생성 된 파티션 확인

Command (m for help): p

Disk /dev/xvda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b3de1

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *        2048     2099199     1048576   83  Linux
/dev/xvda2         2099200    62914559    30407680   8e  Linux LVM
/dev/xvda3        62914560   104857599    20971520   83  Linux     # 파티션 생성 확인

 

• 파티션 유형 변경

Command (m for help): t
Partition number (1-3, default 3): 3
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): w

 

 

• 볼륨 생성 확인

[root@localhost ~]# fdisk -l
Disk /dev/xvda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b3de1

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *        2048     2099199     1048576   83  Linux
/dev/xvda2         2099200    62914559    30407680   8e  Linux LVM
/dev/xvda3        62914560   104857599    20971520   8e  Linux LVM  # LVM 파티션 생성 확인

Disk /dev/mapper/centos-root: 27.9 GB, 27913093120 bytes, 54517760 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-swap: 3221 MB, 3221225472 bytes, 6291456 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

• 재부팅

• Pv 생성

[root@localhost ~]# pvcreate /dev/xvda3
  Physical volume "/dev/xvda3" successfully created.
[root@localhost ~]#

• Pv 생성 확인

[root@localhost ~]# pvscan
  PV /dev/xvda2   VG centos          lvm2 [<29.00 GiB / 0    free]
  PV /dev/xvda3                      lvm2 [20.00 GiB]			# xvda3 생성 확인
  Total: 2 [<49.00 GiB] / in use: 1 [<29.00 GiB] / in no VG: 1 [20.00 GiB]
[root@localhost ~]#

• vg 볼륨 확인

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <29.00 GiB
  PE Size               4.00 MiB
  Total PE              7423
  Alloc PE / Size       7423 / <29.00 GiB
  Free  PE / Size       0 / 0
  VG UUID               9WTMvz-YHOg-AdMY-QCIS-VM90-yJUj-zGlHNP

•  vg 그룹 확장

[root@localhost ~]# vgextend centos /dev/xvda3
  Volume group "centos" successfully extended
[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               48.99 GiB
  PE Size               4.00 MiB
  Total PE              12542
  Alloc PE / Size       7423 / <29.00 GiB
  Free  PE / Size       5119 / <20.00 GiB
  VG UUID               9WTMvz-YHOg-AdMY-QCIS-VM90-yJUj-zGlHNP

• 파티션 용량 증가

[root@localhost ~]# lvscan
  ACTIVE            '/dev/centos/swap' [3.00 GiB] inherit
  ACTIVE            '/dev/centos/root' [<26.00 GiB] inherit
[root@localhost ~]# lvextend -l +100%FREE /dev/centos/root
  Size of logical volume centos/root changed from <26.00 GiB (6655 extents) to 45.99 GiB (11774 extents).
  Logical volume centos/root successfully resized.
[root@localhost ~]#

• Lv용량 증가 확인

[root@localhost ~]# lvscan
  ACTIVE            '/dev/centos/swap' [3.00 GiB] inherit
  ACTIVE            '/dev/centos/root' [45.99 GiB] inherit

 

• Resize 용량 적용

[root@localhost ~]# resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root
Couldn't find valid filesystem superblock.

위 처럼 에러 발생 시 xfs 파일시스템 적용 방법 진행 해야됨

 

• Xfs 파일시스템 적용

[root@localhost ~]# blkid /dev/mapper/centos-root
/dev/mapper/centos-root: UUID="3701b65c-3a57-4634-94f3-60715f84e9ec" TYPE="xfs"

[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1703680 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=6814720, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=3327, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 6814720 to 12056576

[root@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
devtmpfs                      3.8G     0  3.8G   0% /dev
tmpfs                         3.9G     0  3.9G   0% /dev/shm
tmpfs                         3.9G  9.4M  3.9G   1% /run
tmpfs                         3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root        46G  7.7G   39G  17% /
/dev/xvda1                   1014M  202M  813M  20% /boot
tmpfs                         781M  8.0K  781M   1% /run/user/42
tmpfs                         781M     0  781M   0% /run/user/0
[root@localhost ~]#