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