linux系统VPS扩展硬盘的方法是什么

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[root@cloud ~]# df -hal查看扩容后磁盘情况。

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/vg_cloud-lv_root

7.5G 7.5G 0 100% /

proc 0 0 0 - /proc

sysfs 0 0 0 - /sys

devpts 0 0 0 - /dev/pts

tmpfs 494M 0 494M 0% /dev/shm

/dev/sda1 485M 33M 427M 8% /boot

none 0 0 0 - /proc/sys/fs/binfmt_misc

sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs

[root@cloud wwwroot]# fdisk -l查看分区情况。这里看到/dev/sdc为刚才加上的没有分区的盘。

Disk /dev/sda: 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: 0x00051f5f

Device Boot Start End Blocks Id System

/dev/sda1 * 1 64 512000 83 Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2 64 1306 9972736 8e Linux LVM

Disk /dev/sdb: 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: 0x00000000

Disk /dev/mapper/vg_cloud-lv_root: 8128 MB, 8128561152 bytes

255 heads, 63 sectors/track, 988 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_cloud-lv_swap: 2080 MB, 2080374784 bytes

255 heads, 63 sectors/track, 252 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

[root@cloud ~]# fdisk /dev/sdb进行分区。fdisk进行硬盘分区从实质上说就是对硬盘的一种格式化。

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklable

Building a new DOS disklabel with disk identifier 0x3c59d1a9.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

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 #新建分区

Command action

e extended

p primary partition (1-4)

p #设置为主分区

Partition number (1-4): 1 #主分区号

First cylinder (1-2610, default 1):1 #开始扇区（直接默认回车）

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):2610

Using default value 2610 #结束扇区（直接默认回车）

Command (m for help): t #指定分区类型

Selected partition 1 #选择1号分区

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

Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): w #保存

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@cloud ~]# reboot

======================================================

重启中

======================================================

[root@cloud ~]# vgs

VG #PV #LV #SN Attr VSize VFree

vg_cloud 1 2 0 wz--n- 9.51g 0

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

Physical volume "/dev/sdb1" successfully created

[root@cloud ~]# vgextend vg_cloud /dev/sdb1

Volume group "vg_cloud" successfully extended

[root@cloud ~]# vgdisplay

--- Volume group ---

VG Name vg_cloud

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 59.50 GiB

PE Size 4.00 MiB

Total PE 15233

Alloc PE / Size 2434 / 9.51 GiB

Free PE / Size 12799 / 50.00 GiB

VG UUID I5k6GO-mjni-7dO0-O4TF-RUxH-RNcI-bnWFY3

[root@cloud ~]# lvresize -L +49.900G /dev/vg_cloud/lv_root

Rounding size to boundary between physical extents: 49.90 GiB

Extending logical volume lv_root to 57.47 GiB

Logical volume lv_root successfully resized

[root@cloud ~]# resize2fs /dev/vg_cloud/lv_root

resize2fs 1.41.12 (17-May-2010)

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

old desc_blocks = 1, new_desc_blocks = 4

Performing an on-line resize of /dev/vg_cloud/lv_root to 15066112 (4k) blocks.

The filesystem on /dev/vg_cloud/lv_root is now 15066112 blocks long.

[root@cloud ~]# df -hal

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/vg_cloud-lv_root

57G 7.5G 47G 14% /

proc 0 0 0 - /proc

sysfs 0 0 0 - /sys

devpts 0 0 0 - /dev/pts

tmpfs 494M 0 494M 0% /dev/shm

/dev/sda1 485M 33M 427M 8% /boot

none 0 0 0 - /proc/sys/fs/binfmt_misc

sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs

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扩展成功

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