Esxi扩容一般分两种：

1 直接添加硬盘，制作逻辑卷后加到待扩容的逻辑卷上。

2 用扩容已有硬盘空间给待扩容的逻辑卷扩容。

这里我们采用第2种方法来扩容：

一。关闭虚拟机，编辑虚拟机，把硬盘空间从16G增加到500G,并启动虚拟机

二。在虚拟机里增加分区

查看现在在分区是扩容后的大小

fdisk /dev/sda　增加主分区/dev/sda3　并设置分区为LVM格式

root@31server:~# df -h

文件系统  容量  已用

可用 已用% 挂载点

/dev/mapper/vg0-root  14G

1.1G  12G  9% /

udev  1.5G  4.0K

1.5G  1%

/dev

tmpfs  603M

232K  602M  1% /run

none  5.0M  0

5.0M  0%

/run/lock

none  1.5G  0

1.5G  0%

/run/shm

none  100M  0

100M  0%

/run/user

/dev/sda1  268M  29M

225M  12% /boot

root@31server:~# fdisk /dev/sda

Command (m for help): p

Disk /dev/sda: 536.9 GB, 536870912000

bytes

255 heads, 63 sectors/track, 65270 cylinders,

total 1048576000 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 identifier: 0x000b421d

Device

Boot  Start

End  Blocks  Id

System

/dev/sda1  *

2048  585727  291840  83

Linux

/dev/sda2  585728  33552383  16483328  8e

Linux LVM

Command (m for help): n

Partition type:

p

primary (2 primary, 0 extended, 2

free)

e

extended

Select (default p): p

Partition number (1-4, default

3):

Using default value 3

First sector (33552384-1048575999, default

33552384):

Using default value 33552384

Last sector, +sectors or +size{K,M,G}

(33552384-1048575999, default

1048575999):

Using default value 1048575999

Command (m for help): t

Partition number (1-4): 3

Hex code (type L to list codes):

8e

Changed system type of partition 3 to 8e

(Linux LVM)

Command (m for help): p

Disk /dev/sda: 536.9 GB, 536870912000

bytes

255 heads, 63 sectors/track, 65270 cylinders,

total 1048576000 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 identifier: 0x000b421d

Device

Boot  Start

End  Blocks  Id

System

/dev/sda1  *

2048  585727  291840  83

Linux

/dev/sda2  585728  33552383  16483328  8e

Linux LVM

/dev/sda3  33552384

1048575999  507511808

8e  Linux LVM

Command (m for help): w

The partition table has been

altered!

Calling ioctl() to re-read partition

table.

WARNING: Re-reading the partition table

failed with error 16: 设备或资源忙.

The kernel still uses the old table. The new

table will be used at

the next reboot or after you run partprobe(8)

or kpartx(8)

Syncing disks.

现在已经添加了sda3分区，并且为LVM格式

root@31server:~# fdisk -l /dev/sda

Disk /dev/sda: 536.9 GB, 536870912000

bytes

255 heads, 63 sectors/track, 65270 cylinders,

total 1048576000 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 identifier: 0x000b421d

Device

Boot  Start

End  Blocks  Id

System

/dev/sda1  *

2048  585727  291840  83

Linux

/dev/sda2  585728  33552383  16483328  8e

Linux LVM

/dev/sda3  33552384

1048575999  507511808

8e  Linux LVM

三。创建物理卷，并加入到卷组，然后就可以扩大逻辑卷了。

root@31server:~# pvcreate

/dev/sda3

Device /dev/sda3 not found

(or ignored by filtering).

root@31server:~#

partprobe

root@31server:~# pvcreate

/dev/sda3

Writing physical volume

data to disk "/dev/sda3"

Physical volume

"/dev/sda3" successfully created

root@31server:~# pvs

PV  VG

Fmt  Attr PSize

PFree

/dev/sda2

vg0  lvm2 a--  15.72g  0

/dev/sda3

lvm2 a--

484.00g 484.00g

创建分区后，不能直接pvcreate。需要先运行一下partprobe才可以使用pvcreate命令来创建pv

使用vgextend来扩展vg卷组大小。可以看到扩展后的大小为500G

root@31server:~# vgs

VG  #PV #LV #SN Attr

VSize  VFree

vg0  1

2  0 wz--n- 15.72g

0

root@31server:~# vgextend /dev/vg0 /dev/sda3

Volume group "vg0" successfully extended

root@31server:~# vgs

VG  #PV #LV #SN Attr

VSize  VFree

vg0  2

2  0 wz--n- 499.72g

484.00g

使用lvextend命令来扩容lv逻辑卷空间大小

root@31server:~# lvs

LV  VG  Attr

LSize  Pool

Origin Data%  Move Log Copy%

Convert

root vg0  -wi-ao-- 13.85g

swap vg0  -wi-ao--

1.87g

root@31server:~# lvextend -L +480G /dev/vg0/root

Extending logical volume root to 493.85 GiB

Logical volume root successfully resized

root@31server:~# lvs

LV  VG  Attr

LSize  Pool

Origin Data%  Move Log Copy%

Convert

root vg0  -wi-ao-- 493.85g

swap vg0  -wi-ao--

1.87g

但是这样还并没有结束，扩展完LV后，使用df命令查看。我们的根分区空间并没有变化。

root@31server:~# df -h

文件系统

容量  已用  可用 已用%

挂载点

/dev/mapper/vg0-root  14G  1.1G

12G  9%

/

udev

1.5G

4.0K  1.5G  1% /dev

tmpfs

603M  236K

602M  1%

/run

none

5.0M

0  5.0M

0% /run/lock

none

1.5G

0  1.5G

0% /run/shm

none

100M

0  100M

0% /run/user

/dev/sda1  268M

29M  225M  12% /boot

逻辑卷扩展后并不会马上生效，需要使用“resize2fs”命令重新加载逻辑卷的大

小，该命令只针对ext2/ext3的文件系统(若是 reiserfs的文件系统，则使用

“resize_reiserfs”命令)

root@31server:~# resize2fs /dev/vg0/root

resize2fs 1.42.5 (29-Jul-2012)

Filesystem at /dev/vg0/root is mounted on /; on-line resizing

required

old_desc_blocks = 1, new_desc_blocks = 31

The

filesystem on /dev/vg0/root is now 129460224 blocks long.

root@31server:~# df -h

文件系统

容量  已用  可用 已用%

挂载点

/dev/mapper/vg0-root  487G  1.1G

466G  1%

/

udev

1.5G

4.0K  1.5G  1% /dev

tmpfs

603M  236K

602M  1%

/run

none

5.0M

0  5.0M

0% /run/lock

none

1.5G

0  1.5G

0% /run/shm

none

100M

0  100M

0% /run/user

/dev/sda1  268M

29M  225M  12% /boot