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Stratus Technologies helps Boost the Efficiency and Fault Tolerance of NFV

By Rich Tehrani June 02, 2015
As telcos become software telcos, they are beginning to shed some of their bespoke, proprietary hardware in exchange for NFV software running on OTS computers from white box companies, Dell, HP, Cisco, etc. This move follows similar trends in many markets – thus we’ve seen opinion pieces about how software is eating the world.

It’s all about abstraction really. Software running on smartphones for example can replace fixed-function remote controls. A great example is home stereo equipment provider Sonos and their app versus a hardware remote. Users gain familiarity with the software interface and can operate it on various types of hardware running iOS, Android or any other OS. To some degree this brings with it hardware commoditization – then again, I tread lightly with the idea as it seems to hold little meaning in Cupertino.

In other example, the cloud or something like PaaS can be thought of as mainframe abstraction… You no longer have to deal with the underlying hardware – you can access it through abstraction provided through various software interfaces. Yes, a compiler is another example.

A common concern as a network operator moves to software is – how to ensure the hardware solution has the necessary fault tolerance (FT) or at least high availability (HA). One option in the world of stateful HA is to have 1+1 redundancy which means utilization rates of 45-50% or less. The challenge of course is software telcos are supposed to become much nimbler and lower their costs in order to compete with OTT. OTS hardware is relatively cheap but if you don’t need to double the cost, your telco is in a better financial situation.

Enter Stratus Technologies – the company that was one of the pioneers in the fault tolerant server business back in the eighties along with Tandem Computers. In fact Stratus was launched in Mass along with many of big computer companies of the day like DEC, Wang and Prime.

Over the years, the company went through a bewildering array of acquisitions and spinoffs – suffice it to say, Stratus Technologies is still focused on providing HA solutions. Notice I wrote “solutions.” The point here is the company has taken the best of its fault tolerant, HA technology everRun and placed it in software.

There are a number of benefits to what Stratus has done. Because they have rewritten their technology to take advantage of OTS servers, companies can leverage HA at far lower price points. Moreover, there is tremendous flexibility afforded by the software-only approach. Just as you can assign a priority to an application running on an OS, you can easily – in an automated fashion determine how to distribute network functions - whether they need to be fault tolerant or just HA.

The result is Stratus now considers themselves to be a software defined availability company – an apt name for what they are doing. Moreover, their solution doesn’t require a rewrite of code. The service continuity has fully stateful resiliency and availability – all compatible with currently running applications.

I mentioned at the start that typical stateful fault tolerant systems have 45% utilization or so. Stratus says they have been able to get this number up considerably – as high as 80% in fact.

In fact, Ali Kafel, Sr. Director & Head of Telecom Business Development at the company had this to say about their technology in a recent phone conversation and email exchange:

The Stratus Cloud Technology provides fully stateful FT at much higher utilization because we don’t do 1+1 (like we did in HW) but instead N+k De-Clustered Redundancy where K is much smaller than N (in some small cases just 1). In this scenario, each primary VM has a shadow secondary VM (on a different server) that uses significantly less resources (about 6-10% of the primary).

This means there is no need to dedicate the same number of servers for just the backups. In fact, all the servers (including the K servers) will have secondary VMs and well as primary VMs with stand-up reserve capacity to standup the secondary to become primary if needed. This sophisticated level of resiliency automation is what enables our solution to dramatically increase utilization, and raise the efficiency of redundancy from traditional telecom levels of 45% to levels of 80%+, while providing uncompromised reliability, at a fraction of the cost.

The concept here is formally called the Stratus Automated Virtualized Resilience Layer and it currently works with KVM in OpenStack environments and Ali explained, it may eventually support VMWare. It can coexist with VMWare today. Moreover, there can be a common orchestrator and different levels of resiliency based upon function as I alluded to above. For example DDOS protection functions can be designated FT and voice just HA (isn’t it amazing that voice can be a lower priority than something else these days?).

The idea here is telcos have very complicated environments – the more automation you can apply to deploying VNFs, the better.

Edited by Maurice Nagle

Group Editor-in-Chief, TMC

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