After completing a project to virtualise our infrastructure
I have recently undertaken a project to replicate the data from the main site
to a data centre.
As part of this project I reviewed a number of different
products and techniques and have blogged the following reviews on a products
called Double Take and Veeam.
One of the challenges faced in replicating a virtualised
environment is the trade off in using an OS
in agent style replication against using virtual aware replication techniques.
Whilst the virtual aware techniques generally utilise less overhead on the
infrastructure they generally require the snapshotting of the VMware vmdks.
Microsoft does not support its products where
snapshotting is used, in addition to this there is inherent problems with
creating snapshots on servers that have high I/O. In contrast in-agent replication may not have these problems but it does requires significantly more
resources in the terms of CPU and memory which can be multiplied
if this agent is on many guest operating systems on a host. As part of this project I came up with a high
bridge solution which utilises both technologies to harness the advantages of
both specific types of servers namely high I/O servers such as SQL and
Exchange but inherently do not like snapshots to use in agent style replication
and where servers had little I/O and little data change such as IIS servers or
service type servers we are utilising VMware snapshotting technology.
Please find the reviews here:
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