Extend the size of ext3 partition online in VM

1. Increase disk space in vCenter

2. scan disk on the Linux VM

# fdisk -lu > /tmp/fdisk.
# echo  > /sys/block/sdb/device/rescan
# echo  > /sys/block/sdd/device/rescan
# fdisk -lu > /tmp/fdisk.

3. umount the partition

# umount /Backup
# umount /Data/

4. Extend disk size by fdisk, and command "d" will not format the data in the disk by test

# fdisk -u /dev/sdb

The number of cylinders for this disk is set to .
There is nothing wrong with that, but this is larger than ,
and could in certain setups cause problems with:
) software that runs at boot time (e.g., old versions of LILO)
) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/ FDISK)

Command (m for help): d
Selected partition
Command (m for help): n
Command action
e extended
p primary partition (-)
p
Partition number (-):
First sector (-, default ):
Using default value
Last sector or +size or +sizeM or +sizeK (-, default ):
Using default value 

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

5. Verify the new partition

# e2fsck -f /dev/sdb1
e2fsck 1.39 (-May-)
Pass : Checking inodes, blocks, and sizes
Pass : Checking directory structure
Pass : Checking directory connectivity
Pass : Checking reference counts
Pass : Checking group summary information
/dev/sdb1: / files (24.6% non-contiguous), / blocks

6. Resize new partition in system

# resize2fs /dev/sdb1
resize2fs 1.39 (-May-)
Resizing the filesystem on /dev/sdb1 to  (4k) blocks.
The filesystem on /dev/sdb1 is now  blocks long.

7. Mount new size partition back to system

# mount -all