Methods Migration from On-premise to Cloud

IOSR Journal of Computer Engineering (IOSR-JCE)
e-ISSN: 2278-0661,p-ISSN: 2278-8727, Volume 17, Issue 2, Ver. IV (Mar – Apr. 2015), PP 58-65
www.iosrjournals.org
DOI: 10.9790/0661-17245865 www.iosrjournals.org 58 | Page
Methods Migration from On-premise to Cloud
Khadija SABIRI1
, Faouzia BENABBOU1
1
Department of Mathematics and Computer Science, Science Faculty Ben M’Sik, Morocco
Abstract: Cloud computing is evolving as a key computing platform for sharing resources that include
infrastructures, software, applications, and business. An increasing number of companies are expected to
migrate their applications to cloud environment. So when planning to move a legacy style application to the
cloud various challenges arise. The potential size and complexity of such a project might especially discourage
small or medium companies trying to benefit from the advantages the cloud promises. By analyzing the research
achievements and application status, we divide the existing migration methods into three strategies according to
the cloud service models integrally. Different processes need to be considered for different migration strategies,
and different tasks will be involved accordingly. Moreover, we have also observed that there is hardly any
guidance available for migrating existing systems to cloud computing in terms of software engineering aspects.
In this paper, we propose an architecture that describes the cloud migration process, starting by understand
application architecture, Choice of type of cloud environment and Identification and categorization of the
various types of application migration to the Cloud and solutions for migrating architectural components.
Keywords: Cloud Computing, Cloud Migration Process, Meta Model, Software Migration
I. Introduction
Cloud computing has become an active area of practice and research over the last few years. Although
the term ―Cloud Computing‖ is based on a collection of many old and few new concepts in several research
fields like Service-Oriented Architectures (SOA), distributed and grid computing as well as virtualization. Cloud
computing has become increasingly popular with the industry due to the clear advantage of reducing capital
expenditure and transforming it into operational costs [1].
According to National Institute of Standards and Technology (NIST), Cloud computing is a model for
enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing
resources (e.g. networks, servers, storage, applications, and services) that can be rapidly provisioned and
released with minimal management effort or service provider interaction.
According to the virtualized resources, three cloud service models emerged: infrastructure as a service
(IaaS), platform as a service (PaaS) and software as a service (SaaS) [1−3]. The business model of the cloud is
pay-as-you-go, so enterprises can reduce capital expenditure by leveraging the cloud service [4−6]. Based on
these characteristics, cloud computing provides many benefits needed by enterprise, such as no up-front
investment, lower operating cost, high scalability, and so on [7] .Whereas, public, private, hybrid and
community clouds are the categories of the deployment models.
In order to take advantage of cloud computing and protect the existing investment to legacy system,
enterprise are eager to migrate legacy systems to the cloud today, and many companies consider moving entire
applications or parts of them to the cloud. Application migration is the process of redeploying an application,
typically on newer platforms and infrastructures, the migration of existing applications to the Cloud requires
adapting them to a new computing paradigm.
A legacy system is an outdated computer system that remains in use even after more modern
technology has emerged either because the organization may have invested considerable time and money in it or
the legacy system holds valuable data. Some of organization wrote or rewrote software specially to run in the
cloud.
However, there are cases where an organization has existing application software and wants to run this
on a cloud platform. As with any decision about alternative ways to meet a business need, there should be a
cost-benefit analysis applied when considering to migrate an application. As a result, the study in academia and
the practice in industry on migrating legacy systems to cloud computing are very widespread today.
So far, much research has been done in this field. Some works [8-12] focus on decision making support
for cloud migration in enterprise, since benefits, risks, costs, and organizational and socio-technical factors must
be considered before migration. More researchers concentrate on migration methods, mainly about how to
efficiently migrate legacy system to the cloud [13-18].
Some organizations devote themselves to providing development tool for migrating legacy system to
the cloud [19−22]. Up to now, some innovative methods have been proposed, related tools have been developed,
and lots of organizations have made some trials in migrating legacy systems to cloud computing. According to
the cloud service model, the migration to the cloud is classified into three strategies integrally in this paper.

Methods Migration From On-premise to Cloud
This paper is organized as follows. In Section 2 gives an overall view of Migration Strategy. Section 3
surveys Cloud migration process .Section 4 is reviewed Comparison between the migration strategies. Finally,
the paper concludes and presents the perspective in Section 5.
II. Migration strategy
With regard to the migration types [15], we identify the following migration types that Cloud-enable
applications through adaptation:
 Type I: Replace component(s) with Cloud offerings. This is the least invasive type of migration, where one
or more (architectural) components are replaced by Cloud services. As a result, data and/or business logic
have to be migrated to the Cloud service. A series of configurations, rewiring and adaptation activities to
cope with possible incompatibilities may be triggered as part of this migration. Using Google App Engine
Datastore in place of a local MySQL database is an example.
 Type II: Partially migrate some of the application functionality to the Cloud. This type entails migrating
one or more application layers, or a set of architectural components from one or more layers implementing
a particular functionality to the Cloud. Using a combination of Amazon SimpleDB and EC2 instances to
host the data and business logic is an example of such a migration.
 Type III: Migrate the whole software stack of the application to the Cloud. This is the classic example of
migration to the Cloud, where for example the application is encapsulated in VMs and run on the Cloud.
For some of works like in papers [9], [12], [15] and [41], the focus is on Virtual Machines (VMs) as the
means for migration.
 Type IV: Cloudify the application is a complete migration of the application that takes place. The
application functionality is implemented as a composition of services running on the Cloud.
While Gartner [23] suggests information technology (IT) organizations consider the following five
options when they seek to move legacy systems to the cloud:
-Rehost on infrastructure as a service,
-Refactor for platform as a service,
-Revise for IaaS or PaaS,
-Rebuild on PaaS,
-Replace with software as service.
However, Cisco considers three application migration options including SaaS, PaaS and IaaS in white
paper for migration of enterprise application to the cloud.
They think the migration to SaaS is no longer an application migration but more of a replacement of
the existing application with a SaaS. Migration to PaaS is an option for migrating business applications that are
based on standard application server software such as JavaEE or .net platforms. Migration to IaaS involves
deploying the application on the cloud service provider’s servers. In addition, the criteria that are used for
considering every application migration are discussed [24]. Similarly, Solentive software proposed three main
approaches for migrating legacy system to the cloud in a white paper, namely Iaas, PaaS and SaaS. The white
paper looks at these approaches in detail and analyzes the benefits and disadvantages of each [25].
Through comparing and analyzing, we can categorize the migration into three strategies integrally:
migration to IaaS, migration to PaaS and migration to SaaS. The first strategy implements migration only by
porting legacy system to the cloud by using IaaS. The legacy system will be migrated to the cloud by system
refactoring according to the platform of PaaS in the second strategy. As to the migration to SaaS, it can be
divided into three sub-strategies concretely, namely replacing by SaaS, revising based on SaaS and
reengineering to SaaS.
After comparing and analyzing, we recap the migration types mentioned above. These results are
shown in Table 1.
Table 1 Recap existing migration types
Migration to IaaS Migration to PaaS Migration to SaaS
Paper [18] Type III Type I,II Type I,IV
Paper [26] Revise, Rehost Revise, Refactor, Rebuild Replace
Paper [27] To IaaS To PaaS To SaaS
Paper [28] To IaaS To PaaS To SaaS
III. Cloud Migration Process
Driven by the need to outsource their (or part of) IT-infrastructure, companies have shifted
considerable amounts of their IT from their own premises to external companies. Therefore new delivery
models for software have been emerging that allow the outsourcing of different aspects of an application. The

software as a service (SaaS) model is a prominent example of such an outsourcing model. Other delivery models
such as Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) aim at providing (parts of) the
necessary infrastructure and platform support to easily built and host applications at a provider.
How to move and migrate to the cloud is an unanswered question for many organizations. Application
migration is the process of redeploying an application, typically on newer platforms, and infrastructure.
The process based on three main points:
 Understand application architecture based on decomposition into three layers: business, application,
technical.
 Choice of type of cloud environment— SaaS, PaaS, or IaaS—the application is best suited and what part(s)
of the application to move instead of the whole application.
 Identification and categorization of the various types of application migration to the Cloud and solutions for
migrating architectural components
IV. Application Meta model
Today, many companies consider moving entire applications or parts of them to the cloud.
Applications today are often composite, multi-tier applications, consisting of application components such as
UIs, services, workflows and databases as well as middleware components such as application servers,
workflow engines and database management systems [1, 26, 27]. When moving such a composite application
into the cloud, decisions must be made about putting which tier and even which component of such an
application to which cloud.
The application architecture will affect how an application can be migrated to cloud environments and
sometimes whether an application is suitable for migration. The process begins with analysis of the factors for
the application. Firstly, we have to look into how applications are usually built, we must understand what are the
functionalities, architecture, technology, etc, of all these often huge legacy applications, a detailed assessment is
carried out of the existing IT environment with a view to understand the applications that are appropriate for
moving into the Cloud.
So in this paper the Meta model proposed having the architectural model helps to analyze the legacy
system, and describes the different concerns to be considered to move the applications in cloud on three main
artifacts will be provided:
(i) Business layer,
(ii) Application layer, and
(iii) Technical layer.
Figure 1: Meta-Model Architecture Application
Business layer identified business requirement through business process of legacy application. This
step aims at elaborating the main motivation for migration and the objectives to be achieved. It also provides a
foundation for the changes required in a system and describes system’s behavior specific to cloud computing
environment. Business applications are built based on the requirements from the business users. Also, these
business applications are built to use certain kind of Business transactions or data items. It enables to identify
the criticality of selected application functions and help the IT organization understand the business benefits of
the application.
Application layer: Applications today are often distributed application, consisting of software
components such as UIs, services, workflows and databases as well as middleware components such as
application servers, workflow engines and database management systems. It describes the architectural
components of the application and their relations .The various components of the architecture of the application

are realized based on different technologies that identified which component of the architecture is hosted by
which of the containers. That determines which part of the application is moved to which cloud.
Technical layer: describe usage of the physical resource and the existing physical assets are not utilized
completely resulting in energy loss, higher maintenance cost, etc...
A device is a physical computational resource such as a server, upon which artifacts may be deployed
for execution.
The first activity is associated with identification of the business requirements that initiate the
migration process. This step aims at elaborating the main motivation for migration and the objectives to be
achieved. It also provides a foundation for the changes required in a system and describes system’s behavior
specific to cloud computing environment.
Based on the information collected about the Meta model legacy system, it provides a preliminary
feasibility analysis of the viability and the migration strategies. It also provides preliminary estimates about the
cost and the risks involved.
V. Application Meta model
After an application has been identified as a candidate for cloud migration, based on business and
technical factors, it is necessary to consider for what type of cloud environment—SaaS, PaaS, or IaaS—the
application is best suited. Based on the type of application, the choice of type migration need meet both business
and technical needs.
As shown in Fig. 2 the meta-model describe different migration types to cloud:
 The first type replaces components with cloud offerings.
 The second type is the migration into three strategies integrally: migration to IaaS, migration to PaaS and
migration to SaaS.
Figure 2: Migration types
The most ideal strategy for a special migration to the cloud relies on the individual needs of each
organization and the condition of the legacy system, so organizations need to choose the most rational strategy
before the migration.
With the PaaS strategy, organizations need to determine the extent of modifications required for the
application to be compatible with the cloud platform. If extensive modifications are needed for PaaS, the IaaS
strategy may be a better choice. As an effective software-delivery mechanism, SaaS could be an ideal choice for
independent software vendors.
The concerns shall briefly be outlined:
 SaaS: Companies look for a migration solution to move their existing on-premises applications to a cloud
environment. Application vendors frequently want to evaluate a cloud platform on which to deploy a new
application or SaaS offering.
 PaaS: PaaS Migration is the process of moving from the use of one software operating and deployment
environment to another environment. At this layer customers do not manage their virtual machines, but rely
on the infrastructure layer's compute and storage resources. They merely create applications within an
existing API or programming language.

 IaaS: IaaS migration is mainly offering virtual machines as a (compute) service to users, such as moving
from one VM to another, or managing or interoperating the different VMs. In addition, storage or network
capabilities can also be provided. Instead of purchasing servers or even hosted services, IaaS customers can
procure and operate servers, data storage systems, or networking resources at will.
VI. Implementation
The final activity of this process aims at implementing the designed solutions for migrating a system to
be deployed on a target cloud environment.
The proposed methods realize classification to cloud migration in essence, which can cover all
migration cases.
According to the cloud service model, the migration to the cloud is classified into three strategies, we
explain each one how they could be migrated to environment cloud as shown in fig 3.
Figure 3: Process migration’s Meta model
1.1 Migration to IaaS :
The emphasis of the existing work is on migrating the whole application based on virtualization
technology .Migration to IaaS involves deploying the application on the cloud service provider’s servers. For a
number of works like paper [15], the focus is on Virtual Machines (VMs) as the means for migration.
A virtual machine is built for an application, which is loaded with all the software that will eventually
run in the cloud. Then the virtual machine is uploaded to IaaS vendor’s hosting environment and deployed to
run. IaaS is the best choice for moving applications to the cloud when there is no time to reengineer the
applications for a cloud [28].
Applications do not need modification before migrating to an IaaS model thus organizations can take
advantage of the benefits quickly with minimal investment [15].
With respect to migration method, cloud computing service providers, such as Amazon and Cisco,
provide the details for migrating legacy systems to their platforms [24, 25, 28, 29]. Zhang [30] conducted
migration studies by migrating Hadoop and RUBiS to EC2 cloud platform.
1.2 Migration to PaaS :
Migration based on PaaS is not mandatory for resource management, but it is required to make the
legacy system compatible to the requirement of PaaS provider. Microsoft, Cisco, and Solentive provide guide
for migration to PaaS from technology domain [24, 31 and 32].
Existing applications may need modification to take full advantage of the platform, Depending on the
chosen platformn, existing applications may need to be rewritten if they are not compatible. The legacy system
will be migrated to the cloud by system refactoring or rebuild on Paas according to Gartner [23].
As an example, Tran et al [33] defined the scope of migration software system for the cloud. They
identified all activities in migration that start from getting familiar with the application, the target cloud
platform, and the third party tool, then to build the environment and get ready for migration, as well as to
modify and test to ensure that the application properly runs in the cloud. Finally based on the experience of
migrating PetShop DotNet to Windows Azure and migrating JavaPetStore to Amazon EC2, they compared the
difference between migrating legacy system to PaaS and to IaaS.

1.3 Migration to SaaS :
The migration strategy through replacing legacy system by SaaS does not refer to reengineering the
legacy system, and the only work needs to be done is to export local data to the cloud database. For the
migration strategy of revising based on SaaS, some functionality of legacy system will be outsourced to the
cloud, and then the business process is used to integrate cloud and non-cloud services. For the migration strategy
of reengineering to SaaS Zhang and al [16] proposed a generic methodology to guide how to migrate legacy
system to cloud platform. The generic methodology includes the following steps: representation of the legacy
application, redesign the architecture model with identified services, model driven architecture (MDA)
transformation, web service generation, invocation of legacy functionalities, selection of a suitable cloud
computing platform, and provision of cloud web service to the end users. This seven-step methodology guides
developers to migrate legacy systems step by step and improves the productivity and effectiveness of migration.
In addition to the migration methodology, some research on the implementation of migration to SaaS
was carried out. Current approaches are often limited to specific cloud environments or do not provide
automated support for the alignment with a cloud environment. Frey and Hasselbring[34] proposed a model-
based approach CloudMIG for migrating legacy software system to scalable and resource-efficient cloud-based
application. CloudMig concentrates on the SaaS provider perspective and facilitates the migration of enterprise
software system towards generic IaaS and PaaS-based cloud environment. CloudMIG can generate considerable
parts of a resource-efficient target architecture utilizing a rule-based heuristics, so it helps SaaS providers to
semi-automatically migrate existing software to the cloud computing platform.
Through investigation of existing research, reuse and migration of legacy applications to interoperable
cloud services (REMICS), a research project supported by the European Commission that started in 2010 for a
period of three years, has identified further work that needs to be done in the project. Specifically, knowledge
discovery involves business and rule recovery that are necessary for identifying services and designing new
business processes except reverse engineering of legacy code. Comprehensive methodology is employed to
address dedicated design patterns and transformations, especially for migration to the cloud. Migration tools and
methods need integration with model-based development methods. PIM for SOA and cloud computing can
adapt many different platforms in the cloud and diverging technologies. These problems have been partially
addressed by developing methods, languages, transformations and tools. The REMICS methodology will
integrate all these in an agile, model-driven, and service-oriented methodology for modernizing legacy systems
in the end. The migration starts with the recover activity which extracts the architecture of the legacy
application. The recover activity is implemented by knowledge discovery and reverse engineering. The source
architecture helps to analyze the legacy system, identify the best ways for migration, and benefit from model-
driven engineering technologies for generation of the new system. The migrate activity reforms the source
architecture into target architecture for service cloud platform. In migration activities, SOA and cloud
computing patterns are applied, legacy components may be replaced or wrapped, and architecture may be
redesigned by service composition. After obtaining target architecture, the service cloud implementation is
achieved by MDA. In short, REMICS proposes a leap progress in legacy systems migration to service clouds,
which significantly improves the baseline ADM concept [35, 38]. This project involves the most advanced
research in migrating legacy system to service cloud now.
Project ARTIST [39] proposes a comprehensive software modernization approach covering business
and technical aspects. In particular, ARTIST employs Model-Driven Engineering (MDE) techniques to
automate the reverse engineering of legacy software and forward engineering of cloud-based software in a way
that modernized software truly benefits from targeted cloud environments. Therewith, ARTIST aims at reducing
the risks, time, and costs of software modernization and lowers the barriers to exploit cloud computing
capabilities and new business models.
MODAClouds [40] based on the migration of cloud-based software between cloud providers and their
interoperability is primarily focused rather than the migration of legacy software to cloud-based software as a
means of software modernization.
It is a rather coarse-grained modeling approach seems to be applied for selecting cloud providers. Run-
time information is employed in MODAClouds to monitor and reconfigure running cloud-based software.
In summary, migration to SaaS requires to consider the specific migration strategy according to legacy
system and existing SaaS. If existing SaaS has the same business functionality of legacy system, users can
replace legacy system by SaaS. When some business functionality has been realized by existing SaaS, legacy
system can be modernized by revising legacy system based on existing SaaS. Users can take full advantage of
the virtue of the cloud by reengineering legacy system to SaaS, but the challenge cannot be ignored.
VII. Comparison Between The Migration Strategy
Evaluating applications, designing migration types, and migrating applications to a targeted cloud
computing model or models is a demanding task. It requires detailed application migration process design

experience and deep understanding of cloud computing models as well as detailed knowledge of how the
applications interact with both each other, the external (cloud) environment, and the underlying infrastructure. It
also requires experience integrating IT systems and cloud management, and being a significant project in its
own right a structured approach to program management.
The companies still ask about choice of which migration type is suitable for there; the most ideal
approach depends on the individual needs of each organization. Business with existing applications that want to
migrate to the cloud could consider the IaaS or PaaS approach. With the PaaS approach, companies need to
determine the extent of modifications required for the application to be compatible with the platform.
If modifications are extensive, it would be best for an organization to select the IaaS approach.
However, if modifications are minor, organizations would benefit from the PaaS approach.
Company’s looking to develop new applications would benefit from the PaaS approach as they are
given access to the underlying services to quickly develop a functional application. Business need to be wary
that they do not get locked into a platform as moving to another platform could be difficult at a later stage.
Before developing their own cloud applications, organizations should take advantage of what is
commercially available. SaaS could be an option for business is looking to quickly gain access to a business
application without the initial outlay. Companies opting for the SaaS approach also benefit from automated
updates and reduced maintenance costs. However, organizations need to be cautious of locking themselves into
a vendor as switching could be difficult in the future.
There is another criteria used for considering a SaaS deployment, including SLAs, data portability,
long-term costs, user management, and security, should be considered for a cloud migration.
VIII. Conclusion and perspectives
Migration to the cloud raises currently a range of questions. Software migration is the process of
moving legacy systems from one operation environment to another, which is, in most cases, thought to be better.
Migrating legacy system to cloud computing can effectively protect software assets and take advantage of cloud
computing. Many research projects have been carried out, and some innovative methods and tools have been
proposed so far.
In this paper we proposed a meta-model of legacy application to identify different level requirement
and we classified migration types into three, in addition we proposed a meta-model to guide how the software
component are migrated integrally in migration types. At the present we are working on elaborating the process
to modernize a legacy system before to move to environment cloud, based on the Architecture Driven
Modernization approach proposes to base the modernization activities on the architectural models rather than
code artifacts. The major goal is the existing systems meet the new business need in cloud.
In this concept, modernization starts with the extraction of the architecture of the legacy application.
Having the architectural model helps to analyze the legacy system, identify the best ways for modernization and
benefit from Model-Driven Engineering (MDE) technologies for generation of the new system. This
information will be then translated into models covering different aspects of the architecture: business
architecture, application and data architecture, technical architecture. And finally redesign and redeploy existing
applications in a model driven architecture (MDA) falls into this category.
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