Увеличение LVM раздела для OS CentOS

Менеджер логических томов (англ. logical volume manager) — подсистема операционных систем Linux и OS/2, позволяющая использовать разные области одного жёсткого диска и/или области с разных жёстких дисков как один логический том. Реализована с помощью подсистемы device mapper [1].

1. Просмотр текущих разделов и устройств:

[root@centos-vm ~]# fdisk -l

Disk /dev/sda: 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: 0x000ae3ad

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM

Disk /dev/mapper/cl-root: 8585 MB, 8585740288 bytes, 16769024 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/cl-swap: 1073 MB, 1073741824 bytes, 2097152 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

2. Подключаемся к нашему диску /dev/sda и создаём новый раздел:

Partition number (1-4) - выбирается следующий свободный номер. Так как sda1 и sda2 уже заняты, используем следующий номер после двойки, это 3.

[root@centos-vm ~]# fdisk /dev/sda
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): p

Disk /dev/sda: 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: 0x000ae3ad

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM

Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
First sector (20971520-104857599, default 20971520):
Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-104857599, default 104857599):
Using default value 104857599
Partition 3 of type Linux and of size 40 GiB is set

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

Command (m for help): p

Disk /dev/sda: 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: 0x000ae3ad

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM
/dev/sda3 20971520 104857599 41943040 8e Linux LVM

Command (m for help): w
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 or after you run partprobe(8) or kpartx(8)
Syncing disks.

3. Выполняем перезагрузку виртуальной машины

4. Проверяем создание нового LVM-раздела

[root@centos-vm ~]# fdisk -l

Disk /dev/sda: 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: 0x000ae3ad

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM
/dev/sda3 20971520 104857599 41943040 8e Linux LVM

Disk /dev/mapper/cl-root: 8585 MB, 8585740288 bytes, 16769024 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/cl-swap: 1073 MB, 1073741824 bytes, 2097152 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

5. Расширение диска

5.1. Создаём том

[root@centos-vm ~]# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created.

5.2. Просмотр и расширение требуемого диска

[root@centos-vm ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 8.0G 1.2G 6.9G 15% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 916M 0 916M 0% /dev/shm
tmpfs 916M 8.5M 908M 1% /run
tmpfs 916M 0 916M 0% /sys/fs/cgroup
/dev/sda1 1014M 138M 877M 14% /boot
tmpfs 184M 0 184M 0% /run/user/0
[root@centos-vm ~]# vgdisplay
--- Volume group ---
VG Name cl
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 9.00 GiB
PE Size 4.00 MiB
Total PE 2303
Alloc PE / Size 2303 / 9.00 GiB
Free PE / Size 0 / 0
VG UUID WXAeXq-GrUz-4R1B-tn0b-vkk1-ZbjA-UaNUqF

[root@centos-vm ~]# vgextend cl /dev/sda3
Volume group "cl" successfully extended
[root@centos-vm ~]# pvscan
PV /dev/sda2 VG cl lvm2 [9.00 GiB / 0 free]
PV /dev/sda3 VG cl lvm2 [40.00 GiB / 40.00 GiB free]
Total: 2 [48.99 GiB] / in use: 2 [48.99 GiB] / in no VG: 0 [0 ]
[root@centos-vm ~]# lvdisplay
--- Logical volume ---
LV Path /dev/cl/swap
LV Name swap
VG Name cl
LV UUID wBczTI-WAlw-Unoj-PYsp-Kc15-WCTN-7cMMwL
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2017-08-14 09:00:36 +0300
LV Status available
# open 2
LV Size 1.00 GiB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1

--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID vnVoAA-SmHx-UUAv-35dL-FlL1-vMdz-Su2iCW
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2017-08-14 09:00:36 +0300
LV Status available
# open 1
LV Size 8.00 GiB
Current LE 2047
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

[root@centos-vm ~]# lvextend -l+100%FREE /dev/cl/root
Size of logical volume cl/root changed from 8.00 GiB (2047 extents) to 47.99 GiB (12286 extents).
Logical volume cl/root successfully resized.
[root@centos-vm ~]# vgscan
Reading volume groups from cache.
Found volume group "cl" using metadata type lvm2
[root@centos-vm ~]# vgchange -ay
2 logical volume(s) in volume group "cl" now active
[root@centos-vm ~]# xfs_growfs /dev/cl/root
meta-data=/dev/mapper/cl-root isize=512 agcount=4, agsize=524032 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2096128, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 2096128 to 12580864
[root@centos-vm ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 48G 1.2G 47G 3% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 916M 0 916M 0% /dev/shm
tmpfs 916M 8.5M 908M 1% /run
tmpfs 916M 0 916M 0% /sys/fs/cgroup
/dev/sda1 1014M 138M 877M 14% /boot
tmpfs 184M 0 184M 0% /run/user/0

 

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