Linux LVM简明教程
建2块 linux lvm 格式的 分区
fdisk /dev/vdb
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 0x06d8c027.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-524287999, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-524287999, default 524287999): +140G
Partition 1 of type Linux and of size 140 GiB is set
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/vdb: 268.4 GB, 268435456000 bytes, 524288000 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: 0x06d8c027
Device Boot Start End Blocks Id System
/dev/vdb1 2048 293603327 146800640 8e Linux LVM
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p):
Using default response p
Partition number (2-4, default 2):
First sector (293603328-524287999, default 293603328):
Using default value 293603328
Last sector, +sectors or +size{K,M,G} (293603328-524287999, default 524287999): +100G
Partition 2 of type Linux and of size 100 GiB is set
Command (m for help): t
Partition number (1,2, default 2):
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/vdb: 268.4 GB, 268435456000 bytes, 524288000 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: 0x06d8c027
Device Boot Start End Blocks Id System
/dev/vdb1 2048 293603327 146800640 8e Linux LVM
/dev/vdb2 293603328 503318527 104857600 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
准备物理卷
yum install -y lvm2
[root@weifeng ~]# ls /dev/vdb1 /dev/vdb1 [root@weifeng ~]# partprobe [root@weifeng~]# ls /dev/vdb1 /dev/vdb1 [root@weifeng ~]# ls /dev/vdb2 /dev/vdb2
创建物理卷
[root@weifeng ~]# pvcreate /dev/vdb1 Physical volume "/dev/vdb1" successfully created. [root@weifeng ~]# pvcreate /dev/vdb2 Physical volume "/dev/vdb2" successfully created.
查看物理卷
[root@weifeng ~]# pvdisplay "/dev/vdb2" is a new physical volume of "100.00 GiB" --- NEW Physical volume --- PV Name /dev/vdb2 VG Name PV Size 100.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID R1t7xi-rdXN-YyFm-fe60-EEHl-5lzd-IEoscW "/dev/vdb1" is a new physical volume of "140.00 GiB" --- NEW Physical volume --- PV Name /dev/vdb1 VG Name PV Size 140.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID wXq8wP-ccgu-JvOz-yUk9-9SvR-XnuQ-k05zEN
查看物理卷
[root@weifeng ~]# pvs PV VG Fmt Attr PSize PFree /dev/vdb1 lvm2 --- 140.00g 140.00g /dev/vdb2 lvm2 --- 100.00g 100.00g
创建卷组
[root@weifeng ~]# vgcreate vg1 /dev/vdb1 /dev/vdb2 Volume group "vg1" successfully created
查看卷组
[root@weifeng ~]# vgdisplay --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 1 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 239.99 GiB PE Size 4.00 MiB Total PE 61438 Alloc PE / Size 0 / 0 Free PE / Size 61438 / 239.99 GiB VG UUID A4eITy-lscO-9pAv-hCqF-qA7v-LCTw-gdmkhU [root@weifeng ~]# vgs VG #PV #LV #SN Attr VSize VFree vg1 2 0 0 wz--n- 239.99g 239.99g
创建逻辑卷
[root@weifeng ~]# lvcreate -L 140G -n lv1 vg1
Logical volume "lv1" created.
[root@weifeng ~]# mkfs.xfs /dev/vg1/lv1
meta-data=/dev/vg1/lv1 isize=512 agcount=4, agsize=9175040 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=36700160, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=17920, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@weifeng ~]# mkdir /var/lib/docker
[root@weifeng ~]# mount /dev/vg1/lv1 /var/lib/docker
[root@weifeng ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.5G 0 7.5G 0% /dev
tmpfs 7.6G 0 7.6G 0% /dev/shm
tmpfs 7.6G 460K 7.6G 1% /run
tmpfs 7.6G 0 7.6G 0% /sys/fs/cgroup
/dev/vda1 59G 2.1G 55G 4% /
tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/mapper/vg1-lv1 140G 33M 140G 1% /var/lib/docker
[root@weifeng ~]# lvcreate -L 98G -n lv2 vg1
Logical volume "lv2" created.
[root@weifeng ~]# mkfs.xfs /dev/vg1/lv2
meta-data=/dev/vg1/lv2 isize=512 agcount=4, agsize=6422528 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=25690112, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=12544, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@weifeng ~]# mkdir /workspace
[root@weifeng ~]# mount /dev/vg1/lv2 /workspace
[root@weifeng ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.5G 0 7.5G 0% /dev
tmpfs 7.6G 0 7.6G 0% /dev/shm
tmpfs 7.6G 464K 7.6G 1% /run
tmpfs 7.6G 0 7.6G 0% /sys/fs/cgroup
/dev/vda1 59G 2.1G 55G 4% /
tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/mapper/vg1-lv1 140G 33M 140G 1% /var/lib/docker
/dev/mapper/vg1-lv2 98G 33M 98G 1% /workspace
修改fstab文件
[root@weifeng ~]# cat /etc/fstab /dev/mapper/vg1-lv1 /var/lib/docker xfs defaults 0 0 /dev/mapper/vg1-lv2 /workspace xfs defaults 0 0
删除分区
fdisk /dev/vdb 输入 d , wq
删除 vg
[root@rocketmq-1 ~]# vgremove vg1 Do you really want to remove volume group "vg1" containing 2 logical volumes? [y/n]: y Do you really want to remove active logical volume vg1/lv1? [y/n]: y Logical volume "lv1" successfully removed Do you really want to remove active logical volume vg1/lv2? [y/n]: y Logical volume "lv2" successfully removed Volume group "vg1" successfully removed [root@rocketmq-1 ~]# vgdisplay [root@rocketmq-1 ~]# mkfs.xfs -f /dev/vdb
进行扩容操作
[root@compute ~]# umount /mnt/
[root@compute ~]# lvresize -L 200M /dev/vg1/lv1
New size (50 extents) matches existing size (50 extents).
检查磁盘
[root@compute ~]# e2fsck -f /dev/vg1/lv1
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/vg1/lv1: 11/25688 files (9.1% non-contiguous), 8896/102400 blocks
更新逻辑卷信息
[root@compute ~]# resize2fs /dev/vg1/lv1
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/vg1/lv1 to 204800 (1k) blocks.
The filesystem on /dev/vg1/lv1 is now 204800 blocks long.
分区已经扩容
[root@compute ~]# mount /dev/vg1/lv1 /mnt/
[root@compute ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 18G 2.1G 16G 12% /
devtmpfs 907M 0 907M 0% /dev
tmpfs 917M 0 917M 0% /dev/shm
tmpfs 917M 8.6M 908M 1% /run
tmpfs 917M 0 917M 0% /sys/fs/cgroup
/dev/sda1 497M 169M 328M 34% /boot
tmpfs 184M 0 184M 0% /run/user/0
/dev/mapper/vg1-lv1 190M 1.6M 175M 1% /mnt
