Linux LVM简明教程

  

建2块  linux lvm 格式的 分区  

 

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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

 

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yum install -y lvm2

　 

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[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

 

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[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

 

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[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

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[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

  

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[root@weifeng ~]# vgcreate vg1 /dev/vdb1 /dev/vdb2

  Volume group "vg1" successfully created

　　

查看卷组 

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[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

 

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[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

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[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

 

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1 2 3

fdisk /dev/vdb   输入 d , wq

 

删除 vg

 

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[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