Linux逻辑卷的创建与扩容

• 磁盘初始化


[root@xxxx-centos7-template ~]# 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: 0x000a580e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 104857599 52222976 8e Linux LVM
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 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-root: 44.9 GB, 44883247104 bytes, 87662592 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: 8589 MB, 8589934592 bytes, 16777216 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@xxxx-centos7-template ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 42G 1.6G 41G 4% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.5M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 197M 103M 95M 53% /boot
tmpfs 799M 0 799M 0% /run/user/0
[root@xxxx-centos7-template ~]# mkdir /data
[root@xxxx-centos7-template ~]# fdisk /dev/sdb
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x3bb4b474.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
Command (m for help): p
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x3bb4b474
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@xxxx-centos7-template ~]# partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.

• 物理卷，卷组 创建

[root@xxxxcentos7-template ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
[root@xxxx-centos7-template ~]# 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 49.80 GiB
PE Size 4.00 MiB
Total PE 12749
Alloc PE / Size 12749 / 49.80 GiB
Free PE / Size 0 / 0
VG UUID uYlfgy-kh0D-YE6a-A3Eq-n4RN-t3QF-C7HBLS
[root@xxxx-centos7-template ~]# vgextend centos /dev/sdb1
Volume group "centos" successfully extended
[root@xxxx-centos7-template ~]# pvscan
PV /dev/sda2 VG centos lvm2 [49.80 GiB / 0 free]
PV /dev/sdb1 VG centos lvm2 [<100.00 GiB / <100.00 GiB free]
Total: 2 [<149.80 GiB] / in use: 2 [<149.80 GiB] / in no VG: 0 [0 ]


> * 逻辑卷创建

[root@xxxx-centos7-template ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID vFM0SF-6giK-lWPg-iCTY-usKM-ywpA-bp5zxd
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 2
LV Size 8.00 GiB
Current LE 2048
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID mtRvdH-eFlc-3EiS-xQbW-lqfm-y6K5-bAiZrv
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 1
LV Size 41.80 GiB
Current LE 10701
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
[root@xxxx-centos7-template ~]# lvcreate -L 100G -n data centos
Volume group "centos" has insufficient free space (25599 extents): 25600 required.
[root@skong-centos7-template ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID vFM0SF-6giK-lWPg-iCTY-usKM-ywpA-bp5zxd
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 2
LV Size 8.00 GiB
Current LE 2048
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID mtRvdH-eFlc-3EiS-xQbW-lqfm-y6K5-bAiZrv
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 1
LV Size 41.80 GiB
Current LE 10701
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
[root@xxxx-centos7-template ~]# lvcreate -L 99G -n data centos
Logical volume "data" created.
[root@xxxx-centos7-template ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID vFM0SF-6giK-lWPg-iCTY-usKM-ywpA-bp5zxd
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 2
LV Size 8.00 GiB
Current LE 2048
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID mtRvdH-eFlc-3EiS-xQbW-lqfm-y6K5-bAiZrv
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2018-04-20 13:44:01 +0800
LV Status available
# open 1
LV Size 41.80 GiB
Current LE 10701
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Logical volume ---
LV Path /dev/centos/data
LV Name data
VG Name centos
LV UUID Jj7pYx-vlUm-2z9U-UcK0-Wx3m-182t-UeQH25
LV Write Access read/write
LV Creation host, time xxxx-centos7-template, 2019-03-13 20:50:49 +0800
LV Status available
# open 0
LV Size 99.00 GiB
Current LE 25344
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2


• 挂载lvm


[root@xxxx-centos7-template ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 42G 1.6G 41G 4% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.5M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 197M 103M 95M 53% /boot
tmpfs 799M 0 799M 0% /run/user/0
[root@xxxx-centos7-template ~]# mkfs.ext4 -j /dev/centos/data
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 " alt="Linux逻辑卷的创建与扩容 - 文章图片" />