Linux扩容分区操作过程

查看新增磁盘

在服务器上新加一块10G大小的磁盘

[root@centos002 ~]# fdisk -l

....................................................

Disk /dev/sdb: 10.7 GB, 10737418240 bytes

255 heads, 63 sectors/track, 1305 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

创建分区与格式化

#新建分区

[root@centos002 ~]# fdisk /dev/sdb

Command (m for help): n

Command action

e extended

p primary partition (1-4)

Partition number (1-4): 1

First cylinder (1-1305, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305):

Using default value 1305

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

#格式化分区

[root@centos002 ~]# mkfs.ext4 /dev/sdb1

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2620595 blocks

131029 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=2684354560

80 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 26 mounts or

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

将新分区更改成支持LVM格式

[root@centos002 ~]# fdisk /dev/sdb

Command (m for help): p

Disk /dev/sdb: 10.7 GB, 10737418240 bytes

255 heads, 63 sectors/track, 1305 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: 0x3ec1c9a6

Device Boot Start End Blocks Id System

/dev/sdb1 1 1305 10482381 83 Linux

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): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

#查看更改后的分区格式

查看VG

[root@centos002 ~]# vgdisplay

--- Volume group ---

VG Name vg_centos002

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 3

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 1

Act PV 1

VG Size 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 0 / 0

VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O

创建PV并查看

[root@centos002 ~]# pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created

[root@centos002 ~]# pvdisplay

--- Physical volume ---

PV Name /dev/sda2

VG Name vg_centos002

PV Size 19.51 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 4994

Free PE 0

Allocated PE 4994

PV UUID Z7AOVb-LEzI-su15-J5lC-alj8-a94k-1NmRRv

"/dev/sdb1" is a new physical volume of "10.00 GiB"

--- NEW Physical volume ---

PV Name /dev/sdb1

VG Name

PV Size 0.00 GiB

Allocatable NO

PE Size 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID 4N37pw-Q59f-FRZE-glEx-lRWh-BY5O-Zk9JrF

查看LV

[root@centos002 ~]# lvdisplay

--- Logical volume ---

LV Path /dev/vg_centos002/lv_root

LV Name lv_root

VG Name vg_centos002

LV UUID 2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL

LV Write Access read/write

LV Creation host, time centos002, 2017-08-21 13:15:29 +0800

LV Status available

# open 1

LV Size 17.57 GiB

Current LE 4498

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

--- Logical volume ---

LV Path /dev/vg_centos002/lv_swap

LV Name lv_swap

VG Name vg_centos002

LV UUID ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM

LV Write Access read/write

LV Creation host, time centos002, 2017-08-21 13:15:34 +0800

LV Status available

# open 1

LV Size 1.94 GiB

Current LE 496

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:1

扩展卷组VG

[root@centos002 ~]# vgextend vg_centos002 /dev/sdb1

Volume group "vg_centos002" successfully extended

[root@centos002 ~]# vgdisplay

--- Volume group ---

VG Name vg_centos002

System ID

Format lvm2

Metadata Areas 2

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 2

Act PV 2

VG Size 29.50 GiB

PE Size 4.00 MiB

Total PE 7552

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 2558 / 9.99 GiB

VG UUID ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O

#此时查看磁盘大小并没有增加

[root@centos002 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_centos002-lv_root

18G 803M 16G 5% /

tmpfs 238M 0 238M 0% /dev/shm

/dev/sda1 77M 28M 425M 7% /boot

扩展逻辑卷LVM

#扩展LVM分区大小

[root@centos002 ~]# lvextend -L 28G /dev/vg_centos002/lv_root

Insufficient free space: 2670 extents needed, but only 2558 available

#报错说明扩容的空间不足，需要调整值

[root@centos002 ~]# lvextend -L 27G /dev/vg_centos002/lv_root

Size of logical volume vg_centos002/lv_root changed from 17.57 GiB (4498 extents) to 27.00 GiB (6912 extents).

Logical volume lv_root successfully resized.

重设分区大小

#重设根分区大小

[root@centos002 ~]# resize2fs /dev/vg_centos002/lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vg_centos002/lv_root is mounted on /; on-line resizing required

old desc_blocks = 2, new_desc_blocks = 2

Performing an on-line resize of /dev/vg_centos002/lv_root to 7077888 (4k) blocks.

The filesystem on /dev/vg_centos002/lv_root is now 7077888 blocks long.

查看新增磁盘

更多相关文章

随机推荐