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。
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)
p
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