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Enterprise Virtualization for Desktops
Enterprise Virtualization Manager: Image Management
Enterprises use tools like Ghost™ to manage physical desktop images. Red Hat has applied this operating
paradigm in Enterprise Virtualization Manager, and enables a powerful mechanism to manage virtual
desktop images. Enterprise Virtualization Manager uses a template/diff mechanism (called the image
management system) to easily manage images and create new desktops. The template could be the
standard enterprise build with the regular applications required for every user.
Red Hat Enterprise Virtualization Manager includes template/diff mechanisms where only the base image (or
template)isstored,andanyusercustomization(proles,userspecicapplications)arestoredinanadditional
image layer (or the diff layer). This dramatically reduces the amount of storage required. For example, an
enterprise’s regular desktop image is 10 GB. Normally, for 100 users, the enterprise would need to allocate
1 TB (10 GB x 100 images). But with Enterprise Virtualization Manager, each user’s customization is stored
as an “incremental layer” or a diff that usually occupies about 1 GB. Hence, the amount of storage required
wouldbea10GBbaseimage+100usersx1GBuserdiffs=110GB.Thisrepresentsasignicantsavingsfor
the enterprise (relative to 1 TB), and is seamless from a user and IT perspective. IT administrators are able
to leverage the Red Hat image management system in order to create new virtual desktop images, take
snapshots of existing images, and create virtual desktop templates. Virtual desktop images can also be
archived and backed up to the enterprises storage infrastructure.
Enterprise Virtualization Manager: High Availability (HA) Manager
The HA manager ensures the availability of the Enterprise Virtualization Hypervisor and Enterprise
Virtualization Manager.
Enterprise Virtualization Hypervisor High Availability
If a particular Enterprise Virtualization Hypervisor fails, the HA manager will know which desktops were
running on that particular Enterprise Virtualization Hypervisor, and will immediately distribute (or load
balances) those desktops onto the remaining Enterprise Virtualization Hypervisors and (due to the
Enterprise Virtualization Hypervisor failure). The user will experience downtime equal to the time that it
takes the OS to restart. IT will not need to intervene during this process. At the same time, the HA manager
will alert the IT administrator via the management system that a Enterprise Virtualization Hypervisor has
failed and that the desktops have been successfully restarted.
Enterprise Virtualization Manager High Availability
If a particular Enterprise Virtualization Manager fails, the HA manager running on the standby Enterprise
Virtualization Manager will pick up the failure event, and instructs the standby Enterprise Virtualization
Manager to take over as the master. Failure of an Enterprise Virtualization Manager will be designed to have
no impact on users that are already logged into the system. None of the already running virtual desktops will
be affected. For the switchover time (less than two minutes) however, new users will not be able to log onto
the system and new desktops cannot run until the backup Enterprise Virtualization Manager takes over.
The entire Enterprise Virtualization Manager for Desktops system is designed to be fully redundant at the
Enterprise Virtualization Hypervisor and Enterprise Virtualization Manager levels.
(30 paginas)
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