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Journal of Cloud Computing:
Advances, Systems and Applications
Endoetal. JournalofCloudComputing: Advances,Systems andApplications (2016) 5:16DOI 10.1186/s13677-016-0066-8REVIEW Open Access
High availability in clouds: systematic
review and research challengesPatricia T. Endo
1,2* , Moisés Rodrigues 2 , Glauco E. Gonçalves 2,3 , Judith Kelner 2 , Djamel H. Sadok 2 and Calin Curescu 4Abstract
Cloud Computing has been used by different types of clients because it has many advantages, including the
minimization of infrastructure resources costs, and its elasticity property, which allows services to be scaled up or
down according to the current demand. From the Cloud provider point-of-view, there are many challenges to be
overcome in order to deliver Cloud services that meet all requirements defined in Service Level Agreements (SLAs).
High availability has been one of the biggest challenges for providers, and many services can be used to improve theavailability of a service, such as checkpointing, load balancing, and redundancy. Beyond services, we can also find
infrastructure and middleware solutions. This systematic review has as its main goal to present and discuss high
available (HA) solutions for Cloud Computing, and to introduce some research challenges in this area. We hope this
work can be used as a starting point to understanding and coping with HA problems in Cloud. Keywords:Cloud computing, High availability, Systematic review, Research challengesIntroduction
Cloud Computing emerged as a novel technology at the since. The Cloud can be seen as a conceptual layer on the Internet, which makes all available software and hardware resources transparent, rendering them accessible through a well-defined interface. Concepts like on-demand self- service, broad network access, resource pooling [1] and other trademarks of Cloud Computing services are thekey components of its current popularity. Cloud Com-puting attracts users by minimizing infrastructure invest-
ments and resource management costs while presenting a flexible and elastic service. Managing such infrastructure remains a great challenge, considering clients" require- ments for zero outage [2, 3]. Service downtime not only negatively effects in user experience but directly translates into revenue loss. A report [4] from the International Working Group onCloud Computing Resiliency (IWGCR)
1 gathers informa- tion regarding services downtime and associated revenue losses.ItpointsoutthatCloudFoundry 2 downtimeresults *Correspondence: patricia.endo@upe.br 1 University of Pernambuco (UPE), BR 104 S/N, Caruaru, Brazil Full list of author information is available at the end of the articlein $336,000 less revenue per hour. Paypal, the online pay-ment system, experiences in a revenue loss of $225,000
per hour. To mitigate the outages, Cloud providers have been focusing on ways to enhance their infrastructure and management strategies to achieve high available (HA) services. According to [5] availability is calculated as the percent- age of time an application and its services are available, given a specific time interval. One achieves high avail- ability (HA) when the service in question is unavailable less than 5.25 minutes per year, meaning at least 99.999 % availability ("five nines"). In [5], authors define that HA systems are fault tolerant systems with no single point of failure; in other words, when a system component fails, it does not necessarily cause the termination of the service provided by that component.Delivering a higher level of availability has been oneof the biggest challenges for Cloud providers. The pri-
mary goal of this work is to present a systematic review and discuss the state-of-the-art HA solutions for Cloud Computing. The authors hope that the observation of such solutions could be used as a good starting point to addressing with some of the problems present in the HACloud Computing area.© 2016 The Author(s).Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and
reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the
Creative Commons license, and indicate if changes were made. Endoetal. JournalofCloudComputing: Advances,SystemsandApplications (2016) 5:16 Page 2 of 15 This work is structured as follows: "Cloud outages" section describes some Cloud outages that occurred in 2014 and 2015, and how administrators overcame these problems; "Systematic review" section presents the methodology used to guide our systematic review; "Overview of high availability in Clouds" section presents an overview regarding HA Cloud solutions; "Results description" section describes works about HA services based on our systematic review result; "Discussions" section discusses some research challenges in this area; and "Final considerations" section delineates final considerations.