Old Systems, New World: How to Make Decisions About Legacy Estate With Cloud


As organizations evolve, they need platforms and services which might be resilient whereas being responsive to alter. The straightforward actuality is that almost all even have an enormous legacy of data and purposes operating on outdated platforms. So, what ought to organizations do about their legacy estate on their journey to cloud?

Though many organizations are adopting digital by default and cloud first methods, it makes little sense to move the whole thing of a legacy property to the cloud. Firstly, not all applications are cloud-capable or cloud-ready. Secondly, merely moving current applications to the cloud can result in transferring and perpetuating old issues as well as creating new ones.

Cloud is not right for every part; taking cloud-first too literally can result in avoidable issues including elevated working prices, delays to digital transformation and under-investment in crucial enterprise capabilities served by legacy. The many benefits of cloud ought to all the time be assessed on a case-by-case or wants basis.

Locked-in value of legacy

The primary challenges around supporting and making safe and predictable modifications to legacy programs are the cost and time resulting from manual build, deployment, check and integration strategies. This latency additionally impacts cybersecurity posture given the increased time taken to patch, upgrade and test.

In this context, it may be easy to fall into a mindset that legacy has no worth when in actuality, many legacy programs have considerable locked-in worth in terms of the data held, the functionality supplied and the deep data that surrounds them.

The question is therefore how best to manage and unlock this value so that it can be readily and quickly exploited to help a wider digital transformation agenda, which often requires a shift in focus away from the applying centricity of legacy towards a data-driven enterprise.

Nuanced approach

If the embedded worth of legacy is to not be lost, dealing with legacy requires a balanced method. Not all workloads can or should be moved to the cloud, nor do they necessarily should be moved in brief shrift; legacy could also be extra simply and quickly exploited in-situ and processes optimised by means of focused intervention, thereby avoiding or delaying the need to move.

Fully understanding the role that legacy should play in digital transformation is vital to success. If gaps in data exist, then these should be closed through a programme of focused discovery framed towards a pre-defined digital vision and technique. To avoid missed alternative, the historic questions ‘what do we’ve?’; ‘will we nonetheless want it?’; ‘how long do we need it for?’ should be supplemented with ‘does it make sense to re-use/exploit it?’; ‘can we improve it?’; ‘what position does it play in transformation?’ and most importantly, a focus on the quickest way of delivering benefit as efficiently as possible.

On the principle that proactive legacy interventions usually fall into the 4 categories under, we will begin to define the position of legacy in terms of actions that might be needed on the general journey.

ProtectingDeal with a particular maintenance-related concern
Exploitative: Launch locked-in worth for a particular objective
Evolutionary: Impact incremental change from inside with a number of transformation steps
Transformative: Impact a wholesale change in a single step

Exploitative techniques such as data scraping to supply data-centric platforms; development of Software Programming Interfaces (APIs) and microservices to open up legacy programs; and utility virtualization and containerization can all present helpful alternatives to tear and substitute sort approaches each within the brief and long term. Similarly, evolutionary strategies equivalent to Area Pushed Refactoring can each assist de-risk transformation and help benefits-related prioritisations. The place Redevelop or Retire is the popular method, protective measures for legacy because the System of File should still need to be utilized in the interim or during the transition.

Realistic targets

Cloud is an expertise enabler, not a cure-all, and its advent has further confused the image by including new expertise paradigms into the combo. While it represents a necessary part of the general value base, it’s far outweighed by the price of individuals and processes. Redesigning totally automated processes around capabilities from the underside up and underpinning these with cloud and other enabling technologies such as edge and IoT is the place efficiencies are actually realised. Migrating legacy to cloud will not be a precursor to this, nor ought to or not it’s, but the worth in legacy and its exploitation is an input and often an accelerator along the way.

Making sustainable and proportionate decisions about legacy systems and data is not easy and setting the flawed targets will be detrimental to final result. Nevertheless, the final word transformation targets stay the sametargeting and measuring outcomes and progress primarily based on enterprise efficiency (cost, throughput of change, quality, availability) aligned to development and innovation are the key to providing the liberty to make knowledgeable and balanced selections on roadmaps and priorities. The evolution and exploitation of legacy and its related data is prime to realize these targets given that value and timeline constraints will always limit any wholesale transformation.

Legacy treatments

When considering legacy in the context of cloud, treatments traditionally fall into six main classes:

Decommission applications that are out of date, redundant or will become so as a result of a deliberate alternative or policy/process change.

Leave the application as is, both as a result of other priorities, dependencies, levels of investment, or compatibility.

Migrate (rehost)
Entry-level move to cloud IaaS (Infrastructure as a Service) with minimal change or ‘Elevate and Shift’.

Modernize (refactor/rearchitect/replatform/encapsulate)
Mid-range move to cloud addressing some utility component degree issues such as exploiting cloud PaaS (Platform as a Service) in addition to the underlying IaaS migration activity above.

Redevelop (replace/rearchitect/refactor)
Re-instantiate on cloud using cloud-native technologies.