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Resizing the Virtual Disk
The first step is to modify the amount of disk space VMware is allocating to your XI image.
VMware ESX Server has the capability to change virtual disk size with the VM running. DO NOT do this, as it is confirmed to be
unstable for some setups and environments. Shutdown the VM before making any changes to the virtual disk.
The virtual disk size setting you need can be found under:

(Your VM) → Summary → Commands → Edit Settings → Hardware → Hard Disk 1 → Capacity → New Size.
For VMware Player:
The disk size setting can be found using the following options on the overview page:
(Your VM) → Edit virtual machine settings → Hardware → Hard Disk (SCSI) → Utilities → Expand → Maximum disk size

Increase the drive to the size you require and then power on the Virtual Appliance.

Resizing the Partition
The next step is to modify the Linux partition table within the XI virtual machine to recognize that the disk size has changed. This can
be done using the fdisk utility, which is a partition editor. For the virtual machine provided by Nagios Enterprises:

/dev/sda1 is used for the root/boot partition

Establish a terminal session to your Nagios NA server and then execute the following command:
fdisk /dev/sda
You should print the current partition table so you can keep track of your changes as you go.
Command (m for help): p

Take a screenshot of it or copy the screen contents for a text file in case you want to reference it later.
To resize a partition, you actually “delete” it and then add a new one with the new size, making sure to place the beginning of the new
partition at the same sector/cylinder as the old one started. This process is NOT destructive, your data still remains on the disk. These
first steps are for deleting the partition:
Press d to delete the partition
Command (m for help): d


These next steps re-create the Primary partition:
Command (m for help): n
Command action
e extended
p primary partition (1-4)
Type p
Partition number (1-4): 1
You should be able to accept the defaults for the start and end point (just press Enter).
Double-check that they make sense when compared to the information printed earlier.


These steps configure the partition type to Linux:
Command (m for help): t
Hex code (type L to list codes): 83
At this point you are done making your changes, and just need to write them to the disk. It is a good idea to print the new partition table
to ensure you entered things correctly. Once thing look okay, you can commit (write) the partition table to disk:
Command (m for help): w
The partition table has been altered!
The write command will exit the fdisk program. 
You will now need to reboot the virtual machine to allow the kernel to recognize the new partition table, execute the following command:
reboot

Resizing the Filesystem
The last step is to change the filesystem residing on the logical volume so that it knows to put files in that space. Execute the following command:
resize2fs /dev/sda1