Within the realm of IT infrastructure, legacy can usually really feel like a foul phrase. Nobody desires to be informed their group is caught with legacy IT infrastructure as a result of it implies that it is previous or outdated.
But, while you really delve into the small print of what legacy means within the context of servers, networking, and different infrastructure, a extra advanced image emerges. Legacy is not at all times dangerous.
To show the purpose, let’s take a better take a look at what legacy IT infrastructure means and the professionals and cons it presents in areas like scalability, price, safety, and past.
What Is Legacy IT Infrastructure?
Legacy IT infrastructure is a generic time period for IT methods, together with each {hardware} and software program, that could be thought-about old-fashioned or now not match to be used.
Legacy infrastructure is mostly outlined by traits like the next:
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Lack of lively vendor assist: If the unique vendor now not helps a system, it might be an indication that it has entered the realm of legacy {hardware} or software program.
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Restricted scalability: Techniques which can be difficult to scale, similar to on-prem servers, might match the definition of legacy infrastructure as a result of they provide much less flexibility than options.
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Safety dangers: IT infrastructure topic to inherent safety flaws is commonly thought-about legacy. A basic (albeit dated) instance is wi-fi routers that solely assist encryption primarily based on the WEP protocol, which has been easily crackable for greater than a decade.
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Integration challenges: Techniques which can be troublesome or not possible to combine with different methods — similar to {hardware} that requires a selected, proprietary working system — could also be thought-about legacy in some instances.
These drawbacks could make legacy methods extra sophisticated to take care of. They’ll additionally cut back their reliability and make them much less cost-effective. This is the reason legacy incessantly carries a unfavorable connotation within the IT ecosystem.
The Ambiguous Which means of Legacy Infrastructure in IT
That mentioned, the difficult factor about defining legacy IT infrastructure with precision is that most of the traits listed above apply to infrastructure that could be thought-about “trendy.” They are not unique to older {hardware} or software program.
As an illustration, loads of purposes, databases, and so forth depend upon proprietary software program that’s troublesome to combine with third-party options. However in lots of instances, these aren’t labeled legacy methods. We simply name them examples of vendor lock-in.
Likewise, most open supply software program — which now helps to power virtually every application in existence — will not be actively supported by a vendor. Open supply is often freely accessible code that organizations might select to make use of at their very own danger. However that does not imply that open supply methods are legacy.
Why Legacy IT Techniques Aren’t All the time Unhealthy
What’s extra, it is not essentially the case {that a} system is dangerous, or in dire want of substitute, simply because it suits the basic definition of legacy IT. There’s an argument to be made that, in lots of instances, legacy methods are price preserving round.
For starters, most legacy infrastructure consists of tried-and-true options. If a enterprise has been utilizing a legacy system for years, it is a dependable funding. It will not be as optimum from a value, scalability, or safety perspective as a extra trendy various. However in some instances, this disadvantage is outweighed by the truth that — in contrast to a brand new, as-yet-unproven answer — legacy methods will be trusted to do what they declare to do as a result of they’ve already been doing it for years.
The truth that legacy methods have been round for some time additionally signifies that it is usually straightforward to search out engineers who know how one can work with them. Hiring specialists within the newest, best know-how will be difficult, particularly given the widespread IT talent shortage. But when a know-how has been in widespread use for many years, IT departments needn’t look as laborious to search out workers certified to assist them.
From a value perspective, too, legacy methods have their advantages. Even when they’re topic to technical debt or operational inefficiencies that improve prices, sticking with them could also be a extra financially sound transfer than endeavor a pricey migration to an alternate system, which can itself current unexpected price drawbacks. (This can be a lesson that some organizations which have undergone cloud repatriation realized the laborious method; they moved to the cloud in a bid to avoid wasting prices, solely to maneuver again as a result of they found that the cloud would not at all times yield the most effective bang per IT buck.)
As for safety, it is laborious to argue {that a} system with inherent, incurable safety flaws is price preserving round. Nevertheless, some IT methods can provide safety advantages not accessible on extra trendy options. As an illustration, mainframes are typically much less prone to be focused by risk actors just because there are a lot of fewer of them in operation. On this sense, utilizing legacy mainframe infrastructure can assist cut back the chance that a corporation will face a ransomware assault or information breach. (To be clear, mainframes will be hacked, identical to another IT methods, however they’re much less frequent targets than are trendy methods which can be extra extensively used.)
Studying to Love Legacy IT
Not one of the above is to say that legacy IT methods ought to hold operating ceaselessly. Some legacy infrastructure is simply too inefficient or dangerous to maintain round.
However it’s to say that legacy IT infrastructure is not at all times evil, or in want of substitute on the first alternative. Typically, it makes extra sense to maintain legacy methods round — and for IT groups to rethink what legacy even means within the first place.
