Category: VMware (ESX / vSphere)

Block size and vmdk size limitation

File is larger than the maximum size supported by datastore.

This happens because by default VMware ESX running VMFS3 uses 1M blocksize with a limitation of 256 GB disk size for the guest virtual machine. However it is possible to change or rather increase the size of disk drive that you can create for the virtual machine. If you can change block size to 2M on VMFS3 filesystem on your ESX server you can create disk drive upto 512GB size for the virtual machine.VMware Recommends following block size to create large disk drive on virtual machines :

1M Block Size max VMFS-3 = 256G
2M Block Size max VMFS-3 = 512G
4M Block Size max VMFS-3 = 1024G
8M Block Size max VMFS-3 = 2048G

File size larger than 2048 GB is not supported on VMFS3 filesystem, using VMFS2 you can go upto 16 M block size but that option is not available on VMFS3 filesystems.To changethe block size on a VMFS3 filesystem you can use vmkfstools command from command line ro reformat the parition. The vmkfstools command can be run on ESX server :

#vmkfstools –create vmfs3 –blocksize 2M vmhba1:0:0:2

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Extending the C drive Disk Space on Virtual Machine (VMWARE)

For Extending the C drive disk space on Virtual Machine (VMWARE):

Step – 1
Adding the additional space on harddisk 1.

Step – 2
Shutdown the system.

Step – 3
Mount the .vmdk file on another virtual machine as disk1 (probably it would
be disk 1).

Step – 4
Configure the disk 1 on second system and reboot.

Step – 5

Disk Part 1

Step – 6
List volumes

Disk Part 2

Step – 7
Select volume #

Disk Part 3

Step – 8
type extend

Step – 9
Shutdown the system

Step – 10
Remove the disk

Step – 11
Start the system A again (now you can see the extended disk).

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VMware ESX and GSX Server.

VMWARE GSX doesn exist anymore. It is replaced by VMWARE Server which is free.

VMWARE server is a free virtualization software that run on a Windows Server platform. Good for testing and smaller environments

VMWARE ESX Is the Hypervisor from VMWARE.

VMWARE ESX server can run up to 128 VM’s at the same time. Your main limits are determined by how much RAM and CPU Power you have.

It has its own OS, so can not be installed upon Windows. But must be installed on the server itself. It uses it own file system: VMFS.
Has really nice features like Vmotion, HA and resource groups.

ESX is a server version and GSX is a client version, ESX is a linux kernal based os, GSX is a program which runs on windows, or even ESX

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Compare VMware ESX Server and ESXi Server.

VMware ESX Server and ESXi Server.

1. VMware ESXi Server has no service console.
The traditional (full) ESX Server has a special built-in virtual machine called the “service console”.

2. VMware ESXi Server uses RCLI instead of service console utilities.
As ESXi doesn’t have any CLI with VMware-related or Linux utilities, VMware needed to provide a CLI interface to ESXi. What VMware came up with is the Remote Command line Interface (RCLI).

3. VMware ESXi Server is extremely thin = fast installation + faster boot.
The service console has been removed from ESXi, the footprint in memory has been reduced to just 32MB. You can run a hypervisor, allowing you to run virtual machines on your server, with just 32MB of RAM overhead. In comparison, the full ESX Server on disk footprint is about 2GB.

4. VMware ESXi Server can be purchased as an embedded hypervisor on hardware.
While ESXi is so small that it can be easily installed and can even be booted from a USB Flash disk, what is truly unique about ESXi is that it is being sold by hardware vendors as a built-in hypervisor.

5. VMware ESXi Server has a “yellow firmware console”.
Instead of the full ESX Server “service console” boot (which looks like a Linux server booting), ESXi has a tiny “Direct Console User Interface (DCUI)”.

6. VMware ESXi Server has server health status built in.
With ESXi some hardware monitoring features are built into the hypervisor. With ESX Server, this is not yet built in. Instead, you must install hardware monitoring software in the service console.

7. VMware ESXi Server requires fewer patches and less rebooting.
The full ESX server essentially has a modified Linux system as the service console, there are many patches that have to be deployed to keep it secure. With ESXi, on the contrary, the server has very few patches that need to be applied. Because ESXi has no service console and it is considered more secure and more reliable. Security, Reliability, and Maintainability, are all major factor when considering a hypervisor.

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