With VMware View, it's possible to formulate any number of desktop pools and assign them to various Active Directory user groups. For instance, you might have a pool for finance, a pool for engineering, and a pool for executives. Each pool might have a different source VM containing different applications, RAM allocations, and CPU allowances, and the pools would be assigned to varying groups for appropriate access.

To end-users, all of these desktop farms appear as options in the client, and users can access their desktops by selecting the appropriate pool.

One of the major benefits to VDI is the ability to quickly and easily add and remove applications, patches, and service packs to large numbers of desktops. With VMware View, this is handled by rebuilding the desktop pool from a different source snapshot than the original. To accomplish this, the original source VM is booted, the necessary changes are made, the source VM is shut down, and an updated snapshot is taken. Then the desktop pool is edited in the VMware View Administrator, whereby each desktop in the pool is shut down, rebuilt from the new source snapshot, and placed back into active service. This can be done immediately, forcing all users to log off, or it can be done gradually, as each user logs off his or her session.

Updating the desktop pool is not a fast process, though that speed is highly dependent on the storage in use. It should be noted that even small changes to the pool, such as modifying the RAM allocated to each desktop VM, require a complete pool rebuild. This should be simpler, but nevertheless beats the process for updating physical desktops.

Client-side View

There are a number of ways to connect to a View desktop VM. Linux, Mac OS X, and Windows clients can all use the Web interface and the Java client, while Windows can use a dedicated VMware View Client as well. Linux systems can also use the VMware View Open Client, which is an open source initiative by VMware to deliver a client that can be run on a broad range of platforms.

There are caveats to each of these methods, however. The best of the bunch seems to be the VMware View Client for Windows, which is slightly odd in that you need to be running Windows on a PC already, somewhat defeating the purpose of VDI. The Java client is very functional and runs well -- with the exception of video and audio reproduction -- on every platform I tested. Visiting YouTube while connected with the Java client is essentially a non-starter, with poor video and spotty audio. Audio streaming alone was better.