Home' Defense Systems : March and April 2014 Contents G between two options, each with its own
merit, sometimes the best choice is both. That is the case with
In the early days of cloud, a lot of experts debated the relative
merits of the multi-tenant and private cloud models. While the
multi-tenant cloud offers greater ef ciency, the private cloud
ensures a higher level of security.
But it is quickly becoming apparent that the best approach
is a hybrid model, particularly in the Defense Department and
other agencies managing classi ed or unclassi ed but sensitive
applications and data.
In those environments, a private cloud is a necessity. But
the same agencies are also likely to have applications and data
that are appropriate for the multi-tenant model. Setting up and
managing two separate environments is neither ef cient nor
cost-effective. That s where the hybrid cloud comes in.
In this approach, multi-tenant and private clouds are
based on a common architecture incorporating a common
management fabric and governed by a common set of policies.
It is a perfect scenario for an IT-as-a-Service approach (see
related story, next page).
"You can broker in a seamless, integrated manner, presenting
the end-user organization with a single set of services, even
if those services are based on a dozen components," said
Doug Bourgeois, a Vice President and Federal Chief Cloud
Executive for VMware.
"Broker" is a key concept, according to analysts at the
Gartner Group. As organizations build out their various IT
service models -- private cloud, multi-tenant cloud as well as
traditional IT -- the IT team needs to position itself as a service
broker, helping users identify acquire the appropriate services.
"IT departments should explore how they can position
themselves as internal cloud service brokers by establishing a
purchasing process that accommodates cloud adoption and
encourages business units to come to the IT organization for
advice and support," Gartner analysts write.
As always, the approach selected depends in part on the
security requirements of the given service -- and the comfort
level of DOD leaders. It appears that many defense IT
executives are still not comfortable with using commercial
cloud services in a big way.
Last year, the Defense Information Systems Agency was
preparing a for Commercial Infrastructure-as-a-Service
procurement that was estimated to be worth $450 million.
However, in November, DISA published a note saying
that agency leaders were "reassessing demand within the
department for commercial cloud solutions" meeting DOD
requirements. The program might still go forward but with "a
signi cantly lowered ceiling," according to the notice.
THE HYBRID CLOUD:
BECAUSE ONE SIZE DOES NOT FIT ALL
to Meet Agency Missions
T- S- -S R
Experts increasingly see software-defined network (SDN) as a
critical piece of any full-scale virtualization strategy.
Server virtualization gets halfway there, because it makes it
possible to separate applications from the underlying physical
servers, so the compute capacity is much more flexible. But until you
adopt network virtualization, those applications are still tethered to
the network infrastructure.
With SDN, that is no longer the case, meaning it is much easier
to provision network capacity on the fly -- or more important, to
automate that process to occur as business requirements change.
"SDN is increasingly being used as an enabler of cloud service
implementations to support the need for rapid, dynamic and elastic
scalability of the networking component of the cloud service,"
according to a report by Gartner Group.
SDN also is an essential piece of the software-defined data
center. SDCC combines server, storage and network virtualization to
create a comprehensive virtual infrastructure.
"So in an SDCC, everything is programmable, dynamic, software-
based and on-demand," writes Jim Rapoza, a senior research analyst for
networking application performance at the Aberdeen Group, a market
research and consulting firm. "Whatever is needed for a data center
can be created on the fly, provisioned on an as-needed basis and used
wherever and whenever."
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