Feeds

The Ethernet traffic mix-up

Ethernet communications convergence conumdrum

  • alert
  • submit to reddit

Intelligent flash storage arrays

Tony Lock - Programme Director, Freeform Dynamics

Tony Lock

For much of the past decade the “networking” that connects users to their applications and services has often been taken for granted. But if general networking has been less than widely appreciated, the networks that tie servers to storage have been almost invisible to everyone bar the all-too-few skilled storage administrators who delve into to the art. Many organisations are contemplating significant changes to their IT architectures and IT vendors are promoting a raft of new technologies in the storage arena. This brings up the issue of whether it is it feasible to bring specialised storage networks and general Ethernet data networks together?

General networking is now very firmly based around the TCP/IP protocol and Ethernet whilst storage networking is still grappling with many protocols and network technologies. Amongst these, perhaps the most firmly entrenched is Fibre Channel, a lossless, deterministic protocol designed to ensure that any data sent to the storage disks gets there with minimum latency and very little chance of data corruption. These characteristics were not originally enshrined in the standard Ethernet protocols employed for general networking. While work to incorporate these has continued apace, support is still far from universal and the need for new approaches, equipment and tools has a resulting uptick in the equipment cost.

The networks that tie servers to storage have been almost invisible to everyone bar the all-too-few skilled storage administrators who delve into to the art.

So is it possible to get storage traffic and general network traffic to cost-effectively share a common cabling system, namely Ethernet? Technically the answer is yes, as protocols such as FCoE (Fibre Channel over Ethernet) and iSCSI have now matured sufficiently for mainstream adoption. It is apparent that organisations are beginning to contemplate converging their networking stacks as well as management and with it the cabling infrastructures they employ.

The cost savings of cabling only one storage and data network is attractive as is the flexibility potentially available for dynamic reconfiguration. But there are significant challenges between contemplation of such a change and things happening on the ground. For one, network cable infrastructures have very long lifetimes and replacing them is by no means simple to achieve.

Freeform Dynamics Network Convergence research

Freeform Dynamics research finding.

Despite this, as the chart indicates, organisations are becoming aware of the impact that converged networks could have, even if their implementations have yet to ramp up. That said, there are questions concerning the feasibility of running storage and application traffic on the same physical networks without either users or applications, being affected by service degradation?

The answer is ‘yes’, but expecting it to just work out-of-the-box would be asking a bit much. Managing the complexity of convergence will require sophisticated traffic monitoring and management tools to ensure that service quality is maintained at desired levels. An understanding of the base line for the current usage and service quality combined with projections of future growth requirements of each of the services to be delivered over the network is essential – yet few organisations undertake such management processes routinely today.

To use a network to support all forms of traffic will require new processes to be put in place as well as the use of new tools. The lack of much “established best practice” to date coupled with significant costs and operational challenges make it highly likely that the adoption of combined networks will take place over many years, not months.

Tony Lock is a Programme Director at Freeform Dynamics, responsible for driving coverage in the areas of Systems Infrastructure and Management, IT Service Management, Outsourcing, and emerging hosting models such as Software as a Service and Cloud Computing. He also considers the role of financial models in relation to IT investment.


Still a conundrum or all clear?

What can we draw from this? Technically running FCoE over Ethernet is okay, as Greg Ferro explains, and it presents interesting possibilities with virtual machines (Duncan HUghes) but don't expect it to work fresh out of the box. It has to be planned, managed and monitored carefully because this is going to be a "version 1" initiative. Converged Ethernet networking is not a silver bullet and needs careful and thorough preparation and implementation so you don't shoot yourself in the foot.

Go forward, but step carefully. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
BOFH: WHERE did this 'fax-enabled' printer UPGRADE come from?
Don't worry about that cable, it's part of the config
Azure TITSUP caused by INFINITE LOOP
Fat fingered geo-block kept Aussies in the dark
You think the CLOUD's insecure? It's BETTER than UK.GOV's DATA CENTRES
We don't even know where some of them ARE – Maude
Want to STUFF Facebook with blatant ADVERTISING? Fine! But you must PAY
Pony up or push off, Zuck tells social marketeers
Yahoo! blames! MONSTER! email! OUTAGE! on! CUT! CABLE! bungle!
Weekend woe for BT as telco struggles to restore service
Oi, Europe! Tell US feds to GTFO of our servers, say Microsoft and pals
By writing a really angry letter about how it's harming our cloud business, ta
prev story

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Simplify SSL certificate management across the enterprise
Simple steps to take control of SSL across the enterprise, and recommendations for a management platform for full visibility and single-point of control for these Certificates.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.