5 Myths about Cloud HA and DR
October 09, 2014

Jerry Melnick
SIOS Technology

Share this

Enterprises are moving more and more applications to the cloud. The use of cloud computing is growing, and by 2016 this growth will increase to become the bulk of new IT spend, according to Gartner, Inc. 2016 will be a defining year for cloud as private cloud begins to give way to hybrid cloud, and nearly half of large enterprises will have hybrid cloud deployments by the end of 2017.

While the benefits of the cloud may be clear for applications that can tolerate brief periods of downtime, for mission-critical applications, such as SQL Server, Oracle and SAP, companies need a strategy for high availability (HA) and disaster recovery (DR) protection. While traditional SAN-based clusters are not possible in these environments, SANless clusters can provide an easy, cost-efficient alternative.

According to Gartner, IT service failover automation provides end-to-end IT service startup, shutdown and failover operations for disaster recovery (DR) and continuous availability. It establishes ordering and dependency rules as well as IT service failover policies. The potential business impact of this emerging technology is high, reducing the amount of spare infrastructure that is needed to ensure DR and continuous availability, as well as helping ensure that recovery policies work when failures occur, thus improving business process uptime.

Separating the truths and myths of HA and DR in cloud deployments can dramatically reduce data center costs and risks. In this blog, I debunk the following five myths:

Myth #1 - Clouds are HA Environments

Public cloud deployments, particularly with leading cloud providers, are high availability environments where application downtime is negligible.

The Truth - Redundancy is not the same as HA. Some cloud solutions offer some measure of data protection through redundancy. However, applications such as SQL Server and file servers still need additional configuration for automating and managing high availability and disaster recovery.

Myth #2 - Protecting business critical applications in a cloud with a cluster is impossible without shared storage

You cannot provide HA for Windows applications in a cloud using Windows Server Failover Clustering (WSFC) to create a cluster because it requires a shared storage device, such a SAN. A SAN to support WSFC is not offered in public clouds, such as Amazon EC2 and Windows Azure.

The Truth - You can provide high availability protection for Windows applications in a cloud simply by adding SANless cluster software as an ingredient and configuring a WSFC environment. The SANless software synchronizes local storage in the cloud through real-time, block level replication, providing applications with immediate access to current data in the event of a failover.

Myth #3 ­ Remote replication isn’t needed for DR

Applications and data are protected from disaster in the cloud without additional configuration.

The Truth - Cloud providers experience downtime and regional disasters like any other large organization. While providing high availability within the cloud will protect data centers from normal hardware failures and other unexpected outages within an availability zone (Amazon) or fault domain (Azure), data centers still need to protect against regional disasters. The easiest solution is to configure a multisite (geographically separated) cluster within a cloud and extend it by adding an additional node(s) in an alternate datacenter or different geographic region.

Myth #4 - Using the cloud is “all or nothing”

The Truth - Companies can use the on-premise datacenter as its primary datacenter and cloud as the hot standby DR site. DR configurations can be assembled from a single on-premise server that includes a remote cluster member hosted in the cloud. Or, the on-premise configuration could be a traditional SAN based cluster that includes a remote cluster member hosted in a cloud. Both approaches are very cost effective alternatives to building out a separate DR site, or renting rack space in a business continuity facility.

Myth #5 - HA in a cloud has to be costly and complicated

The Truth - A cluster for high availability in a cloud can be easily created using SANless clustering software with an intuitive configuration interface that lets users create a standard WSFC in a cloud without specialized skills. SANless clustering software also eliminates the need to buy costly enterprise edition versions of Windows applications to get high availability and added disaster protection or as described in Myth 4, to eliminate the need to build out a remote recovery site.

Jerry Melnick is COO of SIOS Technology.

Jerry Melnick is President and CEO of SIOS Technology
Share this

The Latest

October 20, 2021

Over three quarters (79%) of database professionals are now using either a paid-for or in-house monitoring tool, according to a new survey from Redgate Software ...

October 19, 2021

Gartner announced the top strategic technology trends that organizations need to explore in 2022. With CEOs and Boards striving to find growth through direct digital connections with customers, CIOs' priorities must reflect the same business imperatives, which run through each of Gartner's top strategic tech trends for 2022 ...

October 18, 2021

Distributed tracing has been growing in popularity as a primary tool for investigating performance issues in microservices systems. Our recent DevOps Pulse survey shows a 38% increase year-over-year in organizations' tracing use. Furthermore, 64% of those respondents who are not yet using tracing indicated plans to adopt it in the next two years ...

October 14, 2021

Businesses are embracing artificial intelligence (AI) technologies to improve network performance and security, according to a new State of AIOps Study, conducted by ZK Research and Masergy ...

October 13, 2021

What may have appeared to be a stopgap solution in the spring of 2020 is now clearly our new workplace reality: It's impossible to walk back so many of the developments in workflow we've seen since then. The question is no longer when we'll all get back to the office, but how the companies that are lagging in their technological ability to facilitate remote work can catch up ...

October 12, 2021

The pandemic accelerated organizations' journey to the cloud to enable agile, on-demand, flexible access to resources, helping them align with a digital business's dynamic needs. We heard from many of our customers at the start of lockdown last year, saying they had to shift to a remote work environment, seemingly overnight, and this effort was heavily cloud-reliant. However, blindly forging ahead can backfire ...

October 07, 2021

SmartBear recently released the results of its 2021 State of Software Quality | Testing survey. I doubt you'll be surprised to hear that a "lack of time" was reported as the number one challenge to doing more testing, especially as release frequencies continue to increase. However, it was disheartening to see that a lack of time was also the number one response when we asked people to identify the biggest blocker to professional development ...

October 06, 2021

The role of the CIO is evolving with an increased focus on unlocking customer connections through service innovation, according to the 2021 Global CIO Survey. The study reveals the shift in the role of the CIO with the majority of CIO respondents stating innovation, operational efficiency, and customer experience as their top priorities ...

October 05, 2021

The perception of IT support has dramatically improved thanks to the successful response of service desks to the pandemic, lockdowns and working from home, according to new research from the Service Desk Institute (SDI), sponsored by Sunrise Software ...

October 04, 2021

Is your company trying to use artificial intelligence (AI) for business purposes like sales and marketing, finance or customer experience? If not, why not? If so, has it struggled to start AI projects and get them to work effectively? ...