Vdisk expansion preparation :Data is priceless ，you should clone or take a snapshot .
STEP1: login c# vsphere client or web client modify the vm property，add a vdisk and input the size you want to expansion.
STEP2: login the guest linux os with root ,
#echo "- - -" > /sys/class/scsi_host/host0/scan
(if still can't see the vdisk，can echo "- - -" > /sys/class/scsi_host/host1/scan ,untill # fdisk -l can see the add vdisk
STEP3:create pv and extend vgs
[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
[root@localhost ~]# vgextend rootvg /dev/sdb
Volume group "rootvg" successfully extended
STEP4:extend lv and reszie filesysystem
[root@localhost ~]# lvextend -L 39G /dev/mapper/rootvg-home_lv Extending logical volume home_lv to 39.00 GiB
Logical volume home_lv successfully resized
[root@localhost ~]# resize2fs /dev/mapper/rootvg-home_lv
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/rootvg-home_lv is mounted on /home; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/rootvg-home_lv to 10223616 (4k) blocks.
The filesystem on /dev/mapper/rootvg-home_lv is now 10223616 blocks long.
example (rootvg-root_lv enxtend 9GB) ：
[root@CNSZBSQ-000027 ~]# fdisk -l
Disk /dev/sda: 525 MB, 525467648 bytes
4 heads, 32 sectors/track, 8018 cylinders
Units = cylinders of 128 * 512 = 65536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x2028d392
Device Boot Start End Blocks Id System
/dev/sda1 * 2 8001 512000 83 Linux
Disk /dev/sdb: 92.3 GB, 92347170816 bytes
26 heads, 62 sectors/track, 111889 cylinders
Units = cylinders of 1612 * 512 = 825344 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4959f9c1
Device Boot Start End Blocks Id System
/dev/sdb1 1 111888 90181632 8e Linux LVM
Disk /dev/mapper/rootvg-root_lv: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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/rootvg-was_lv: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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/rootvg-tmp_lv: 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
Disk /dev/mapper/rootvg-swap_lv: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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@CNSZBSQ-000027 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@CNSZBSQ-000027 ~]# fdisk -l
Disk /dev/sda: 525 MB, 525467648 bytes
4 heads, 32 sectors/track, 8018 cylinders
Units = cylinders of 128 * 512 = 65536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x2028d392
Device Boot Start End Blocks Id System
/dev/sda1 * 2 8001 512000 83 Linux
Disk /dev/sdb: 92.3 GB, 92347170816 bytes
26 heads, 62 sectors/track, 111889 cylinders
Units = cylinders of 1612 * 512 = 825344 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4959f9c1
Device Boot Start End Blocks Id System
/dev/sdb1 1 111888 90181632 8e Linux LVM
Disk /dev/mapper/rootvg-root_lv: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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/rootvg-was_lv: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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/rootvg-tmp_lv: 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
Disk /dev/mapper/rootvg-swap_lv: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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@CNSZBSQ-000027 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@CNSZBSQ-000027 ~]# fdisk -l
Disk /dev/sda: 525 MB, 525467648 bytes
4 heads, 32 sectors/track, 8018 cylinders
Units = cylinders of 128 * 512 = 65536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x2028d392
Device Boot Start End Blocks Id System
/dev/sda1 * 2 8001 512000 83 Linux
Disk /dev/sdb: 92.3 GB, 92347170816 bytes
26 heads, 62 sectors/track, 111889 cylinders
Units = cylinders of 1612 * 512 = 825344 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4959f9c1
Device Boot Start End Blocks Id System
/dev/sdb1 1 111888 90181632 8e Linux LVM
Disk /dev/mapper/rootvg-root_lv: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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/rootvg-was_lv: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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/rootvg-tmp_lv: 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
Disk /dev/mapper/rootvg-swap_lv: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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@CNSZBSQ-000027 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan
[root@CNSZBSQ-000027 ~]# fdisk -l
Disk /dev/sda: 525 MB, 525467648 bytes
4 heads, 32 sectors/track, 8018 cylinders
Units = cylinders of 128 * 512 = 65536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x2028d392
Device Boot Start End Blocks Id System
/dev/sda1 * 2 8001 512000 83 Linux
Disk /dev/sdb: 92.3 GB, 92347170816 bytes
26 heads, 62 sectors/track, 111889 cylinders
Units = cylinders of 1612 * 512 = 825344 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4959f9c1
Device Boot Start End Blocks Id System
/dev/sdb1 1 111888 90181632 8e Linux LVM
Disk /dev/mapper/rootvg-root_lv: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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/rootvg-was_lv: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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/rootvg-tmp_lv: 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
Disk /dev/mapper/rootvg-swap_lv: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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/sdc: 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
[root@CNSZBSQ-000027 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root_lv ext4 20G 6.2G 13G 33% /
tmpfs tmpfs 940M 72K 940M 1% /dev/shm
/dev/mapper/rootvg-was_lv ext4 40G 9.8G 28G 26% /websphere
/dev/sda1 ext4 485M 56M 404M 13% /boot
/dev/mapper/rootvg-tmp_lv ext4 10G 216M 9.3G 3% /tmp
[root@CNSZBSQ-000027 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 1 4 0 wz--n- 86.00g 0
[root@CNSZBSQ-000027 ~]# pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created
[root@CNSZBSQ-000027 ~]# vgextend rootvg /dev/sdc
Volume group "rootvg" successfully extended
[root@CNSZBSQ-000027 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 4 0 wz--n- 96.00g 10.00g
[root@CNSZBSQ-000027 ~]# lvextend -L 29G /dev/mapper/rootvg-root_lv
Extending logical volume root_lv to 29.00 GiB
Logical volume root_lv successfully resized
[root@CNSZBSQ-000027 ~]# resize2fs /dev/mapper/rootvg-root_lv
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/rootvg-root_lv is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 2
Performing an on-line resize of /dev/mapper/rootvg-root_lv to 7602176 (4k) blocks.
The filesystem on /dev/mapper/rootvg-root_lv is now 7602176 blocks long.
[root@CNSZBSQ-000027 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root_lv ext4 29G 6.2G 22G 23% /
tmpfs tmpfs 940M 72K 940M 1% /dev/shm
/dev/mapper/rootvg-was_lv ext4 40G 9.8G 28G 26% /websphere
/dev/sda1 ext4 485M 56M 404M 13% /boot
/dev/mapper/rootvg-tmp_lv ext4 10G 216M 9.3G 3% /tmp