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Protecting Hyper-V with DPM
Protecting Hyper-V with DPM
In recent years virtualization has exploded in information technology. Many
companies today utilize virtualization to cut costs and scale down their
environments. Microsoft entered the market with Hyper-V and many businesses
began using this as their hypervisor of choice. When DPM was made it was made
with the intention to natively backup Hyper-V. This ensures that the back ups of a
Hyper-V environment will simply work. DPM is Hyper-V aware out of the box.
DPM supports two methods of protecting Hyper-V. DPM is capable of both host
protection with the agent being installed on the Hyper-V host or guest based
protection with the agent being installed on the guest virtual machine and both at the
same time with the agent being installed on the host and inside the virtual machine.
With DPM host based protection the entire virtual hard drive is backed up. This means
when you go to restore you have to restore the entire virtual hard drive. With DPM
agent based backup the data on the guest virtual machine can be backed up just like a
physical server. This includes Microsoft applications that DPM is aware of such as SQL
or Exchange. Both are viable options for protection and function well. It is totally left
up to preference on what type of backup method you would prefer to use.
DPM offers two backup options for Hyper-V they are:
• Online backup : This means that the guest virtual machine is running
Hyper-V integration tools and can be backed up without being taken ofline.
These operating systems support Hyper-V integration tools: Windows Server
2008 R2, Windows Server 2008, and Windows Server 2003. When Hyper-V
integration tools are installed on the guest virtual machine DPM uses the VSS
service running in the guest virtual machine to perform the back up while
the guest virtual machine stays online. This is also known as a VSS request.
• Ofline backup : This is used for non-Microsoft operating systems and legacy
Microsoft operating systems. Examples of non-Microsoft operating systems
are Linux or Mac. Legacy Microsoft operating systems are Windows NT 4.0
and Windows Server 2000, Windows 2000, Windows ME, Windows 98/95
and 3.1. In ofline backup mode DPM pauses the guest virtual machine for
a brief moment while it takes the backup and then brings the guest virtual
machine back online. This is the only way you can actually protect Linux or
other non-Microsoft operating systems. DPM can store up to 512 shadow
copy backups of virtual hard drives.
Both backup options utilize Hyper-V's VSS writer service to back up the VHD's
(Virtual Hard Disks) at the block level and will synchronize any changes. This is
called Express Full backup.