linux for LVM 创建笔记

LVM:

1.创建pv（物理卷）

[root@localhost dev]# pvcreate /dev/sdd /dev/sde /dev/sdf

Writing physical volume data todisk "/dev/sdd"

Physical volume"/dev/sdd" successfully created

Writing physical volume data todisk "/dev/sde"

Physical volume"/dev/sde" successfully created

Writing physical volume data todisk "/dev/sdf"

Physical volume"/dev/sdf" successfully created

查看物理卷：

[root@localhost dev]# pvdisplay -v /dev/sdd

Using physical volume(s) oncommand line

--- Physical volume ---

PV Name /dev/sdd

VG Name vg01

PV Size 8.00 GiB / not usable 4.00 MiB

Allocatable yes

PE Size 4.00 MiB

Total PE 2047

Free PE 2047

Allocated PE 0

PV UUID lTSpmW-BmZj-vuXj-Ouxx-v6H9-bV3k-f5xaZg

2.创建一个VG

VG名字为“vg01”，设备位置放在“/dev/vg01”，其中包含“/dev/sdd /dev/sde /dev/sdf”三个PV

[root@localhost dev]# vgcreate /dev/vg01 /dev/sdd /dev/sde /dev/sdf

Volume group "vg01"successfully created

查看VG：

[root@localhost dev]# vgdisplay -v vg01

Using volume group(s) on commandline

Finding volume group"vg01"

--- Volume group ---

VG Name vg01

System ID

Format lvm2

Metadata Areas 3

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 3

Act PV 3

VG Size 23.99 GiB

PE Size 4.00 MiB

Total PE 6141

Alloc PE / Size 0 / 0

Free PE / Size 6141 / 23.99 GiB

VG UUID HvmwcQ-yUmr-71HP-RSaS-kQLs-T1gg-KTlGzb

--- Physical volumes ---

PV Name /dev/sdd

PV UUID lTSpmW-BmZj-vuXj-Ouxx-v6H9-bV3k-f5xaZg

PV Status allocatable

Total PE / Free PE 2047 / 2047

PV Name /dev/sde

PV UUID y69gjf-x4oe-2hpt-iHR2-rt4Z-IpV4-AQvlhd

PV Status allocatable

Total PE / Free PE 2047 / 2047

PV Name /dev/sdf

PV UUID shvndV-Xo73-4BcO-ogDE-bMFm-YS0Y-P339Lq

PV Status allocatable

Total PE / Free PE 2047 / 2047

3.创建LV

[root@localhost dev]# lvcreate -L 2G -n test_lv001 vg01

Logical volume"test_lv001" created

[root@localhost dev]# lvcreate -L 2G -n test_lv002 vg01

Logical volume"test_lv002" created

[root@localhost dev]# lvcreate -L 3G -n test_lv003 vg01

Logical volume"test_lv003" created

查看LV设备所在位置：

[root@localhost dev]# lvdisplay

--- Logical volume ---

LV Path /dev/vg01/test_lv001

LV Name test_lv001

VG Name vg01

LV UUID 6Vw4p8-0EeJ-PcWC-lHMg-hRYp-X2xI-PCTJM2

LV Write Access read/write

LV Creation host, timelocalhost.localdomain, 2013-03-22 13:02:22 +0800

LV Status available

# open 0

LV Size 2.00 GiB

Current LE 512

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:2

[root@localhost /]# ls -l /dev/vg01/

总用量 0

lrwxrwxrwx. 1 root root 7 3月 22 13:02test_lv001 -> ../dm-2

lrwxrwxrwx. 1 root root 7 3月 22 13:02test_lv002 -> ../dm-3

lrwxrwxrwx. 1 root root 7 3月 22 13:02test_lv003 -> ../dm-4

4.格式化LV

[root@localhost ~]# mkfs.ext3 /dev/vg01/test_lv001

mke2fs 1.41.12 (17-May-2010)

文件系统标签=

操作系统:Linux

块大小=4096 (log=2)

分块大小=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

131072 inodes, 524288 blocks

26214 blocks (5.00%) reserved for the super user

第一个数据块=0

Maximum filesystem blocks=536870912

16 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376,294912

正在写入inode表: 完成

Creating journal (16384 blocks): 完成

Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 36 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

依次格式化test_lv002、test_lv003

5.创建挂载目录，并挂载LV

[root@localhost /]# mkdir test001

[root@localhost /]# mkdir test002

[root@localhost /]# mkdir test003

[root@localhost /]# ls

bin etc lost+found mnt proc selinux test001 tmp

boot home media net root srv test002 usr

dev lib misc opt sbin sys test003 var

[root@localhost /]# df

文件系统 1K-块 已用 可用 已用% 挂载点

/dev/mapper/VolGroup-lv_root

22230908 3594416 17507228 18% /

tmpfs 514488 420 514068 1% /dev/shm

/dev/sda1 495844 31565 438679 7% /boot

[root@localhost /]# mount /dev/vg01/test_lv001 /test001

[root@localhost /]# mount /dev/vg01/test_lv002 /test002

[root@localhost /]# mount /dev/vg01/test_lv003 /test003

[root@localhost /]# df -h

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/VolGroup-lv_root

22G 3.5G 17G 18% /

tmpfs 503M 420K 503M 1% /dev/shm

/dev/sda1 485M 31M 429M 7% /boot

/dev/mapper/vg01-test_lv001

2.0G 68M 1.9G 4% /test001

/dev/mapper/vg01-test_lv002

2.0G 68M 1.9G 4% /test002

/dev/mapper/vg01-test_lv003

3.0G 69M 2.8G 3% /test003

[root@localhost test001]# vi /etc/fstab

在线扩容：

vg中有剩余空间，可直接拓展，如果无剩余空间，需添加新的PV到vg01中。

此处将sdc作为一个PV后，拓展到vg01。

创建PV

[root@localhost test001]# pvcreate /dev/sdc

Writing physical volume data todisk "/dev/sdc"

Physical volume"/dev/sdc" successfully created

添加PV到vg01中：

[root@localhost test001]# vgextend vg01 /dev/sdc

Volume group "vg01"successfully extended

查看vg01详细信息：

[root@localhost test001]# vgdisplay -v vg01

Using volume group(s) on commandline

Finding volume group"vg01"

--- Volume group ---

VG Name vg01

System ID

Format lvm2

Metadata Areas 4

Metadata Sequence No 5

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 3

Open LV 3

Max PV 0

Cur PV 4

Act PV 4

VG Size 31.98 GiB

PE Size 4.00 MiB

Total PE 8188

Alloc PE / Size 1792 / 7.00 GiB

Free PE / Size 6396 / 24.98 GiB

VG UUID HvmwcQ-yUmr-71HP-RSaS-kQLs-T1gg-KTlGzb

--- Logical volume ---

LV Path /dev/vg01/test_lv001

LV Name test_lv001

VG Name vg01

LV UUID 6Vw4p8-0EeJ-PcWC-lHMg-hRYp-X2xI-PCTJM2

LV Write Access read/write

LV Creation host, timelocalhost.localdomain, 2013-03-22 13:02:22 +0800

LV Status available

# open 1

LV Size 2.00 GiB

Current LE 512

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:2

--- Logical volume ---

LV Path /dev/vg01/test_lv002

LV Name test_lv002

VG Name vg01

LV UUID a7Xqm1-FLMp-RW5u-xjTr-4q3D-tjuk-P8g776

LV Write Access read/write

LV Creation host, timelocalhost.localdomain, 2013-03-22 13:02:36 +0800

LV Status available

# open 1

LV Size 2.00 GiB

Current LE 512

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:3

--- Logical volume ---

LV Path /dev/vg01/test_lv003

LV Name test_lv003

VG Name vg01

LV UUID Uh6tFl-dXzA-kSaf-IHAE-OXNA-bxNj-1FYZhZ

LV Write Access read/write

LV Creation host, timelocalhost.localdomain, 2013-03-22 13:02:48 +0800

LV Status available

# open 1

LV Size 3.00 GiB

Current LE 768

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:4

--- Physical volumes ---

PV Name /dev/sdd

PV UUID lTSpmW-BmZj-vuXj-Ouxx-v6H9-bV3k-f5xaZg

PV Status allocatable

Total PE / Free PE 2047 / 255

PV Name /dev/sde

PV UUID y69gjf-x4oe-2hpt-iHR2-rt4Z-IpV4-AQvlhd

PV Status allocatable

Total PE / Free PE 2047 / 2047

PV Name /dev/sdf

PV UUID shvndV-Xo73-4BcO-ogDE-bMFm-YS0Y-P339Lq

PV Status allocatable

Total PE / Free PE 2047 / 2047

PV Name /dev/sdc

PV UUID PLdMOW-9lm3-9Lph-eJ3H-h3Rb-cd3q-x888gY

PV Status allocatable

Total PE / Free PE 2047 / 2047

给test_lv001增加2G空间

[root@localhost /]# lvresize -L +2G /dev/vg01/test_lv001

Extending logical volumetest_lv001 to 4.00 GiB

Logical volume test_lv001successfully resized

[root@localhost /]# df -h

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/VolGroup-lv_root

22G 3.5G 17G 18% /

tmpfs 503M 420K 503M 1% /dev/shm

/dev/sda1 485M 31M 429M 7% /boot

/dev/mapper/vg01-test_lv002

2.0G 68M 1.9G 4% /test002

/dev/mapper/vg01-test_lv003

3.0G 69M 2.8G 3% /test003

/dev/mapper/vg01-test_lv001

2.0G 68M 1.9G 4% /test001

使用resize2fs命令，令新增空间在线生效

[root@localhost /]# resize2fs /dev/vg01/test_lv001

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vg01/test_lv001 is mounted on /test001; on-lineresizing required

old desc_blocks = 1, new_desc_blocks = 1

Performing an on-line resize of /dev/vg01/test_lv001 to 1048576 (4k)blocks.

The filesystem on /dev/vg01/test_lv001 is now 1048576 blocks long.

[root@localhost /]# df -h

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/VolGroup-lv_root

22G 3.5G 17G 18% /

tmpfs 503M 420K 503M 1% /dev/shm

/dev/sda1 485M 31M 429M 7% /boot

/dev/mapper/vg01-test_lv002

2.0G 68M 1.9G 4% /test002

/dev/mapper/vg01-test_lv003

3.0G 69M 2.8G 3% /test003

/dev/mapper/vg01-test_lv001

4.0G 69M 3.7G 2% /test001

[root@localhost /]# lvdisplay -v /dev/vg01/test_lv001

Using logical volume(s) oncommand line

--- Logical volume ---

LV Path /dev/vg01/test_lv001

LV Name test_lv001

VG Name vg01

LV UUID 6Vw4p8-0EeJ-PcWC-lHMg-hRYp-X2xI-PCTJM2

LV Write Access read/write

LV Creation host, timelocalhost.localdomain, 2013-03-22 13:02:22 +0800

LV Status available

# open 1

LV Size 4.00 GiB

Current LE 1024

Segments 3

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:2