Linux LVM在线扩容

环境：

虚拟化环境，SUSE Linux Enterprise
Server 11sp3，直接把虚拟磁盘从100G改成150G。

现有的LVM是100G，/home
的LV需要再加50G。

步骤：

fdisk
先把多加的50G分成一个区，再把该区划成pv，把该pv加到vg里面，再扩LV，最后扩文件系统。

LVM在线扩容" title="Linux LVM在线扩容">

Last login:
Sat Mar 28 16:29:42 2015 from 10.31.29.10

xickDB:~ # df
-h

Filesystem

Size
Used Avail Use% Mounted on

/dev/mapper/system-root
9.9G 5.2G
4.2G 56% /

udev

1.9G
100K 1.9G 1%
/dev

tmpfs

9.0G
72K 9.0G 1%
/dev/shm

/dev/sda1

152M 81M
63M 57% /boot

/dev/mapper/system-home
25G 13G
11G 55% /home

xickDB:~ # fdisk
-l

Disk /dev/sda: 161.1 GB,
161061273600 bytes

255 heads, 63 sectors/track,
19581 cylinders, total 314572800 sectors

... ...

Disk /dev/mapper/system-swap
doesn't contain a valid partition table

xickDB:~ #
vgdisplay

--- Volume
group ---

VG Name

system

System ID

Format

lvm2

...
...

VG Size

99.84 GiB

PE Size

4.00 MiB

Total PE

25560

Alloc PE /
Size 11008
/ 43.00 GiB

Free
PE / Size
14552 / 56.84 GiB

VG UUID

jarXED-0N3v-sey6-P4Rl-tLhp-gJtL-HJ11DB

xickDB:~ # fdisk
/dev/sda

Command (m for help):
n

Command action

e extended

p primary partition
(1-4)

Partition number (1-4, default
3):

Using default value
3

First sector
(209715200-314572799, default
209715200):

Using default value
209715200

Last sector, +sectors or
+size{K,M,G} (209715200-314572799, default
314572799):

Using default value
314572799

Command (m for help):
p

Disk /dev/sda: 161.1 GB,
161061273600 bytes

255 heads, 63 sectors/track,
19581 cylinders, total 314572800 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:
0x0009d2de

Device Boot
Start
End
Blocks Id
System

/dev/sda1 *

2048
321535
159744 83
Linux

/dev/sda2

321536 209715199
104696832 8e
Linux LVM

/dev/sda3
209715200
314572799 52428800
83 Linux

Command (m for help):
w

The partition table has been
altered!

xickDB:~ #
reboot

Broadcast message from root
(pts/1) (Sat Mar 28 16:37:26 2015):

The system is going down for
reboot NOW!

Last login: Sat Mar 28 16:29:59
2015 from 10.31.29.10

xickDB:~
#

xickDB:~ # fdisk
-l

Disk /dev/sda: 161.1 GB,
161061273600 bytes

255 heads, 63 sectors/track,
19581 cylinders, total 314572800 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:
0x0009d2de

Device Boot
Start
End
Blocks Id
System

/dev/sda1 *

2048
321535
159744 83
Linux

/dev/sda2

321536 209715199
104696832 8e
Linux LVM

/dev/sda3
209715200
314572799 52428800
83 Linux

... ...

xickDB:~ # pvs

PV

VG Fmt
Attr PSize
PFree

/dev/sda2
system lvm2 a-- 99.84g
56.84g

xickDB:~ # pvcreate
/dev/sda3

Physical
volume "/dev/sda3" successfully created

xickDB:~ # pvs

PV

VG Fmt
Attr PSize
PFree

/dev/sda2
system lvm2 a-- 99.84g
56.84g

/dev/sda3

lvm2 a-- 50.00g
50.00g

xickDB:~ # vgextend system
/dev/sda3

Volume group
"system" successfully extended

xickDB:~ #
vgdisplay

--- Volume
group ---

VG Name

system

System ID

Format

lvm2

Metadata
Areas
2

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

2

Act PV

2

VG Size

149.84 GiB

PE Size

4.00 MiB

Total PE

38359

Alloc PE /
Size 11008
/ 43.00 GiB

Free
PE / Size
27351 / 106.84 GiB

VG UUID

jarXED-0N3v-sey6-P4Rl-tLhp-gJtL-HJ11DB

xickDB:~ # lvs

LV
VG Attr
LSize
Pool Origin Data% Move Log
Copy% Convert

home system
-wi-ao--- 25.00g

root system
-wi-ao--- 10.00g

swap system
-wi-ao--- 8.00g

xickDB:~ # lvextend
--help

lvextend:
Add space to a logical volume

lvextend

[-A|--autobackup y|n]

[--alloc
AllocationPolicy]

[-d|--debug]

[-f|--force]

[-h|--help]

[-i|--stripes Stripes [-I|--stripesize StripeSize]]

{-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}]
|

-L|--size
[+]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}

[-m|--mirrors Mirrors]

[--nosync]

[--use-policies]

[-n|--nofsck]

[--noudevsync]

[-r|--resizefs]

[-t|--test]

[--type
VolumeType]

[-v|--verbose]

[--version]

LogicalVolume[Path] [ PhysicalVolumePath... ]

xickDB:~ # lvextend --size +50G
/dev/mapper/system-home

Extending
logical volume home to 75.00 GiB

Logical
volume home successfully resized

xickDB:~ # lvs

LV
VG Attr
LSize
Pool Origin Data% Move Log
Copy% Convert

home system
-wi-ao--- 75.00g

root system
-wi-ao--- 10.00g

swap system
-wi-ao--- 8.00g

xickDB:~ # resize2fs
/dev/mapper/system-home

resize2fs 1.41.9
(22-Aug-2009)

Filesystem at
/dev/mapper/system-home is mounted on /home; on-line resizing
required

old desc_blocks = 2,
new_desc_blocks = 5

Performing an on-line resize of
/dev/mapper/system-home to 19660800 (4k) blocks.

The filesystem on
/dev/mapper/system-home is now 19660800 blocks long.

xickDB:~ # df
-h

Filesystem

Size
Used Avail Use% Mounted on

/dev/mapper/system-root
9.9G 5.2G
4.2G 56% /

udev

1.9G
104K 1.9G 1%
/dev

tmpfs

9.0G
72K 9.0G 1%
/dev/shm

/dev/sda1

152M 81M
63M 57% /boot

/dev/mapper/system-home
74G 13G
58G 19% /home