VIRTUALISATION
Virtualisation
from the core
Since Virtualisation burst
business needs. However their
onto the scene a few years
evolving at the same time has
enabled each to prosper.
ago it was envisaged that the
The multiple processors in a single
server would be relegated to architecture with their low energy
the role of pure processing
and low heat dissipation has enabled
engine, but capable of
blade servers to actually deliver
what they promised. This combined
running multiple operating
with Virtualisation’s ability to run
systems guided by the multiple operating systems on a single
Hypervisor/Virtual Machine
processor promised the ultimate in
manager (VMM).
server consolidation opportunities.
The combination of the two
technology revolutions also
T
his VMM abstraction layer answered the issue of scalability. By
effectively is a piece of software a combination of both it was surely
that sits between the hardware just a matter of throwing enough
of the server and the ‘guest’ operating processing capacity at the problem to
systems and allocates system resources solve any scalability issues.
to each O/S as needed. However, as ever in the IT world,
The effi ciency of the VMM give the analysts and programmers lots
astounded everyone and led to of processing capability and they will
major trials and then adoption of use it up and more.
Virtualisation for server consolidation With the limitations of the old
purposes. However despite the hardware, organisations were happy
euphoria surrounding Virtualisation to distribute applications around
there were many concerns about how the organisation using hardware
a virtualised server farm would scale that was dedicated to the role. With
on traditional chip architectures. virtualisation however everything
In parallel with the adoption of can be delivered from a datacenter.
virtualisation technology the IT server Reducing the number of servers to
industry has also been going through be supported and making it easier to
another revolution with the emergence deploy and manage applications.
of multi-core processors. So suddenly we have moved
These came about because chip Virtualisation from a consolidation
manufacturers realised that just
running processors faster and faster did
not deliver the expected throughput
and performance. By building multiple
processors within the same silicon
and running them at slower speeds
manufacturers were able to deliver
better price/performance, at slower
clock speeds, using less energy and at
lower temperatures.
The Virtualisation and multi-
core processor revolutions were not
related and came out of different AMD Opteron
22 8020 EUROPA JUNE 2008
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