mysql 分区 扩充_mysql分区LVM扩容

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场景：mysql的数据库目录为/data随着数据量的增加，该分区不够用了，准备添加一块ssd硬盘，扩容该分区!

下面是测试环境的整个过程：

测试环境：在原有LVM卷标上添加一块50G的新硬盘对LVM进行扩容

1、将添加的新硬盘进行分区：

fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated.

It’s strongly recommended to

switch off the mode (command ‘c’) and change display units to

sectors (command ‘u’).

Command (m for help): n

Command action

e extended

p primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-6527, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G}

(1-6527, default 6527):

Using default value 6527

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e

(Linux LVM)

Command (m for help): p

Disk /dev/sda: 53.7 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0xadc427e3

Device Boot Start End Blocks

Id System

/dev/sda1 1 6527

52428096 8e Linux LVM

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@lvm-test /]#fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0xadc427e3

Device Boot Start End Blocks Id

System

/dev/sda1 1 6527

52428096 8e Linux LVM

Disk /dev/sdb:

21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0x0000e547

Device Boot Start End Blocks

Id System

/dev/sdb1

* 1 26 204800

83 Linux

Partition 1 does not end on cylinder boundary.

/dev/sdb2 26 2611

20765696 8e Linux LVM

Disk /dev/sdc: 32.2 GB, 32212254720 bytes

255 heads, 63 sectors/track, 3916 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0x000468eb

Device Boot Start End Blocks

Id System

/dev/sdc1 1 3917

31456256 8e Linux LVM

Disk /dev/mapper/vg_lvmtest-LogVol00: 21.0

GB, 20971520000 bytes

255 heads, 63 sectors/track, 2549 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0x00000000

Disk /dev/mapper/vg_lvmtest-LogVol01: 32.5

GB, 32497467392 bytes

255 heads, 63 sectors/track, 3950 cylinders

Units = cylinders of 16065 * 512 = 8225280

bytes

Sector size (logical/physical): 512 bytes /

512 bytes

I/O size (minimum/optimal): 512 bytes / 512

bytes

Disk identifier: 0x00000000

2、新建PV:

[root@lvm-test /]# pvcreate

/dev/sda1

Writing physical volume data to disk “/dev/sda1”

Physical volume “/dev/sda1” successfully created

[root@lvm-test /]# pvscan

PV

/dev/sdb2 VG vg_lvmtest lvm2 [19.80 GiB / 0 free]

PV

/dev/sdc1 VG vg_lvmtest lvm2 [30.00 GiB / 0 free]

PV /dev/sda1 lvm2 [50.00 GiB]

Total: 3 [99.80 GiB] / in use: 2 [49.80 GiB] / in no VG: 1 [50.00 GiB]

3加大VG,利用vgextend功能

[root@lvm-test /]# vgextend

vg_lvmtest /dev/sda1

Volume group “vg_lvmtest” successfully extended

[root@lvm-test /]# vgdisplay

—

Volume group —

VG

Name vg_lvmtest

System ID

Format lvm2

Metadata Areas 3

Metadata Sequence No 4

VG

Access read/write

VG

Status resizable

MAX

LV 0

Cur

LV 2

Open LV 2

Max

PV 0

Cur

PV 3

Act

PV 3

VG

Size 99.79 GiB

PE

Size 4.00 MiB

Total PE 25547

Alloc PE / Size 12748 /

49.80 GiB

Free PE / Size 12799 / 50.00 GiB

VG

UUID

QJMQEA-k17Z-O8N8-wP3d-NsEu-G9fy-gUclGB

空闲的PE共有12799,容量为50G

4，利用lvresize来增加

[root@lvm-test /]#lvresize

-l +12799 /dev/vg_lvmtest/LogVol01

Extending logical volume LogVol01 to 80.26 GiB

Logical volume LogVol01 successfully resized

[root@lvm-test /]# lvdisplay

—

Logical volume —

LV

Path /dev/vg_lvmtest/LogVol01

LV

Name LogVol01

VG

Name vg_lvmtest

LV

UUID

ibxmqZ-1HPY-NpXz-KS1n-OzT0-XVa4-hNtvRS

LV

Write Access read/write

LV

Creation host, time lvm-test, 2013-08-15 16:12:22 +0800

LV

Status available

#

open 1

LV

Size 80.26 GiB

Current LE 20547

Segments 3

Allocation inherit

Read ahead sectors auto

–

currently set to 256

Block device 253:1

—

Logical volume —

LV

Path

/dev/vg_lvmtest/LogVol00

LV

Name LogVol00

VG

Name vg_lvmtest

LV

UUID

0h6qFC-Jqzf-7wnP-MAu3-jrMm-Da6D-YuaG8N

LV

Write Access read/write

LV

Creation host, time lvm-test, 2013-08-15 16:12:40 +0800

LV

Status available

#

open 1

LV

Size 19.53 GiB

Current LE 5000

Segments 1

Allocation inherit

Read ahead sectors auto

–

currently set to 256

Block device 253:0

上面执行完之后df -h并没有查看到增加的容量如下所示：

[root@lvm-test /]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_lvmtest-LogVol00

20G 975M

18G 6% /

tmpfs 939M 0

939M 0% /dev/shm

/dev/sdb1 194M 27M

158M 15% /boot

/dev/mapper/vg_lvmtest-LogVol01

30G 193M

29G 1% /data

5、执行最后一步操作：

[root@lvm-test /]# resize2fs

/dev/vg_lvmtest/LogVol01

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vg_lvmtest/LogVol01 is

mounted on /data; on-line resizing required

old desc_blocks = 2, new_desc_blocks = 6

Performing an on-line resize of

/dev/vg_lvmtest/LogVol01 to 21040128 (4k) blocks.

The filesystem on /dev/vg_lvmtest/LogVol01

is now 21040128 blocks long.

[root@lvm-test var]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_lvmtest-LogVol00

20G 992M

18G 6% /

tmpfs 939M 0

939M 0% /dev/shm

/dev/sdb1 194M 27M

158M 15% /boot

/dev/mapper/vg_lvmtest-LogVol01

80G 205M

75G 1% /data

该工具可以实现在线的扩容，不影响用户的使用！

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