一、创建lvm
大致步骤：
1.fdisk /dev/vdb，创建一个分区如/dev/vdb1
2.创建pv，pvcreate /deb/vdb1
3.创建vg，vgcreate name /dev/vdb1
4.创建lv，lvcreate -L 20G -n lvname vgname
root@ubuntu:~# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.27.1).
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.
Created a new DOS disklabel with disk identifier 0x4f478fce.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-41943039, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-41943039, default 41943039):
Created a new partition 1 of type 'Linux' and of size 20 GiB.
Command (m for help): t
Selected partition 1
Partition type (type L to list all types): 8e
Changed type of partition 'Linux' to 'Linux LVM'.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
root@ubuntu:~#
root@ubuntu:~# fdisk -l
Disk /dev/sda: 20 GiB, 21474836480 bytes, 41943040 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
Disklabel type: dos
Disk identifier: 0xca984eb8
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 39942143 39940096 19G 83 Linux
/dev/sda2 39944190 41940991 1996802 975M 5 Extended
/dev/sda5 39944192 41940991 1996800 975M 82 Linux swap / Solaris
Disk /dev/sdb: 20 GiB, 21474836480 bytes, 41943040 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
Disklabel type: dos
Disk identifier: 0x4f478fce
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 41943039 41940992 20G 8e Linux LVM
Disk /dev/sdc: 20 GiB, 21474836480 bytes, 41943040 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@ubuntu:~#
root@ubuntu:~# pvcreate /dev/sdb1
/run/lvm/lvmetad.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
Physical volume "/dev/sdb1" successfully created
root@ubuntu:~# vgcreate sdb1vg1 /dev/sdb1 #sdb1vg1是自己命名的vg名
Volume group "sdb1vg1" successfully created
root@ubuntu:~# lvcreate -L 19G -n lvsdb1 sdb1vg1 #lvsdb1是自己命名的lv名
Logical volume "lvsdb1" created.
root@ubuntu:~# lvdisplay
--- Logical volume ---
LV Path /dev/sdb1vg1/lvsdb1
LV Name lvsdb1
VG Name sdb1vg1
LV UUID M6TXKf-Jsql-SG0C-mVCK-zTPE-OWV3-EkwSGY
LV Write Access read/write
LV Creation host, time ubuntu, 2018-09-16 23:31:31 -0700
LV Status available
# open 0
LV Size 19.00 GiB
Current LE 4864
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
root@ubuntu:~# mkfs.ext3 /dev/sdb1vg1/lvsdb1
mke2fs 1.42.13 (17-May-2015)
Creating filesystem with 4980736 4k blocks and 1245184 inodes
Filesystem UUID: 27702051-2e69-429a-aa21-aea3ab1a6605
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
root@ubuntu:~# mount /dev/sdb1vg1/lvsdb1 /wj/lvmtest1
root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 469M 0 469M 0% /dev
tmpfs 98M 4.5M 93M 5% /run
/dev/sda1 19G 1.6G 17G 9% /
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 488M 0 488M 0% /sys/fs/cgroup
tmpfs 98M 0 98M 0% /run/user/0
/dev/mapper/sdb1vg1-lvsdb1 19G 45M 18G 1% /wj/lvmtest1
root@ubuntu:~#
上述报错用下面命令解决
root@ubuntu:~# systemctl enable lvm2-lvmetad.service
Synchronizing state of lvm2-lvmetad.service with SysV init with /lib/systemd/systemd-sysv-install...
Executing /lib/systemd/systemd-sysv-install enable lvm2-lvmetad
root@ubuntu:~# systemctl enable lvm2-lvmetad.socket
root@ubuntu:~# systemctl start lvm2-lvmetad.service
root@ubuntu:~# systemctl start lvm2-lvmetad.socket
二、lvm扩容
大致步骤
1.fdisk /dev/vdb，创建一个分区如/dev/vdb1
2.创建pv，pvcreate /deb/vdb1
3.vgextend vgname pvname(/dev/vdb1，用lvdisplay查看)
4.lvextend -L +10G lvpath（lvdisplay查看）
5.resize2fs lvpath
先fdisk一块sdc2盘
然后具体操作如下
root@ubuntu:~# pvcreate /dev/sdc2
Physical volume "/dev/sdc2" successfully created
root@ubuntu:~# vgdisplay
--- Volume group ---
VG Name sdb1vg1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 20.00 GiB
PE Size 4.00 MiB
Total PE 5119
Alloc PE / Size 4864 / 19.00 GiB
Free PE / Size 255 / 1020.00 MiB
VG UUID CE3SUU-zD0y-3Rrm-hehH-OXhK-PDVE-XPHClv
root@ubuntu:~# vgextend sdb1vg1 /dev/sdc2
Volume group "sdb1vg1" successfully extended
root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 469M 0 469M 0% /dev
tmpfs 98M 4.5M 93M 5% /run
/dev/sda1 19G 1.6G 17G 9% /
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 488M 0 488M 0% /sys/fs/cgroup
tmpfs 98M 0 98M 0% /run/user/0
/dev/mapper/sdb1vg1-lvsdb1 19G 45M 18G 1% /wj/lvmtest1
root@ubuntu:~# lvdisplay
--- Logical volume ---
LV Path /dev/sdb1vg1/lvsdb1
LV Name lvsdb1
VG Name sdb1vg1
LV UUID M6TXKf-Jsql-SG0C-mVCK-zTPE-OWV3-EkwSGY
LV Write Access read/write
LV Creation host, time ubuntu, 2018-09-16 23:31:31 -0700
LV Status available
# open 1
LV Size 19.00 GiB
Current LE 4864
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
root@ubuntu:~# lvextend -L +5G /dev/sdb1vg1/lvsdb1
Size of logical volume sdb1vg1/lvsdb1 changed from 19.00 GiB (4864 extents) to 24.00 GiB (6144 extents).
Logical volume lvsdb1 successfully resized.
root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 469M 0 469M 0% /dev
tmpfs 98M 4.5M 93M 5% /run
/dev/sda1 19G 1.6G 17G 9% /
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 488M 0 488M 0% /sys/fs/cgroup
tmpfs 98M 0 98M 0% /run/user/0
/dev/mapper/sdb1vg1-lvsdb1 19G 45M 18G 1% /wj/lvmtest1
root@ubuntu:~# resize2fs /dev/sdb1vg1/lvsdb1
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/sdb1vg1/lvsdb1 is mounted on /wj/lvmtest1; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 2
The filesystem on /dev/sdb1vg1/lvsdb1 is now 6291456 (4k) blocks long.
root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 469M 0 469M 0% /dev
tmpfs 98M 4.5M 93M 5% /run
/dev/sda1 19G 1.6G 17G 9% /
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 488M 0 488M 0% /sys/fs/cgroup
tmpfs 98M 0 98M 0% /run/user/0
/dev/mapper/sdb1vg1-lvsdb1 24G 45M 23G 1% /wj/lvmtest1
root@ubuntu:~#
Re-reading the partition table failed.: Device or resource busy
解决：
partprobe
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