Hardware and software vendors like to define information
lifecycle management, ILM, in terms of their own products. The fact
is, however, that ILM is simply a philosophy of ensuring that the
infrastructure chosen for the storing of data is periodically
aligned with and thus relative to the actual business value of the
data throughout its life.
This approach to ILM can be based on a reference architecture
that provides tiers of service of differing capabilities and thus
related costs. But how will a move from tier to tier be triggered?
Everyone talks about ILM, but it seems most implementations are in
fact DLM strategies b where D is for data. What is the difference
between data and information? How is the value of data calculated?
When is the delta in value sufficient to trigger a migration? Are
different strategies needed for structured data, and unstructured
data? Is ILM in fact application specific? What is the impact of
ILM-driven data migration on recovery capabilities? Will the cost
of administering and controlling the ILM environment chew up the
projected savings?
Letb s briefly look at the questions we need to ask of ourselves
and the vendor before embarking on a journey towards ILM.
DLM vs. ILM
Just what is the difference between data and information? How
does it affect lifecycle management? Data generally needs rendering
by an application before the result can be utilized. Information is
data that has been rendered into a human actionable form. What are
the implications?
Valuing Data - $$$ or dreams
This is an area where many vendors take the broadest definition
of value and use subjective measures such as b importance.b If
movement of data is to be automated and based on change in value,
then value needs to have some empirical base. This empirical base
also needs to be capable of dynamically reflecting current b valueb
to allow continuous monitoring for change.
Enough change is enough?
Letb s assume that we have been able to calculate and
subsequently dynamically maintain the value of data over time. Now
we need to ask ourselves what delta in change would be sufficiently
significant to trigger migration to a more appropriate tier of
storage. This is perhaps one of the few easy ILM questions to
answer as we have already learned how to do this when we set up the
service provider model.
ILM b camouflage for archiving and HSM
Even though it may not be possible to effectively value data
dynamically enough to trigger automated migration, some ILM
migrations can be auto triggered by non-value-based criteria such
as date, age and other standardized metadata components; however,
it is difficult to view this activity as anything other than
archiving in an HSM environment.
Once the issues above are well understood, the implications of
these issues are apparent and an understanding of the cost benefit
of ILM has been agreed on, a CIO can develop a transition plan for
data that fits the ILM parameters as follows:
A five-step transition to ILM
1. Determine a cost model that can show savings that will be
delivered by moving data from point A to point B on condition X.
This allows your policies to be developed based on a rational cost
saving basis.
2. Determine your strategic archiving policy. What types of data
will move, what will trigger the move (attribute delta), and where
will it move to based on the attribute?
3. Determine tactical archiving policies. Define for each
specific data type or even data base or file holder, the exact
attribute and its delta metric that will trigger a move to a
defined tier or location.
4. Attempt to model the frequency of change and the migration
time of data along with its impact on production. This will provide
a basis for the degree of automation possible and possibly even a
justification for investment in automation.
5. Develop standard operating procedures with associated
compliance, completion and quality metrics to discipline the
operation and place it on a highly repeatable basis, whether it be
automated or manually triggered.
But above all else b know what you want, why you want it, what
it will cost and what it will save you.
You decide. 061275
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