Troika raises SANs' IQ
SAN Volume Suite sharpens SANs with intelligent servicesFollow @infoworld
Troika Networks may not be the first vendor that comes to mind when talking about intelligent storage networks, but it should be: It has been a pioneer in the field since the company was founded in 1998.
Throughout the years, Troika has packed into its Accelera NSS (network storage services) appliance some unique features, including resilient hardware acceleration for both FC (Fibre Channel) and I/O traffic and the ability to integrate with a variety of third-party applications such as backup, mirroring, and snapshots.
Accelera has also been certified with FC switches and storage arrays from multiple vendors, which means customers get more flexibility in choosing storage gear when they decide to add more capacity or replace aging equipment.
These advantages position the Accelera as a prime candidate for adding intelligence to your SAN. Recently, Troika started bundling its Accelera device with a powerful application suite from longtime partner StoreAge. This single, bundled offering -- the aptly named SVS (SAN Volume Suite) -- is a good move, as SVS simplifies SAN deployment and maintenance and includes powerful applications such as mirroring and snapshots.
Big brain, slim body
I reviewed SVS on a test bed in which the networking gear -- or the head of my test SAN -- far outweighed the body, which was a single, nondescript storage enclosure with 12 Seagate FC drives.
To create a resilient configuration, my test bed had two Acceleras, one with 16 FC ports and the other with eight. Both were connected with double links to fabric switches from Brocade and QLogic.
In addition, my test bed included two dedicated Windows machines running SVS's SVM (Storage Virtualization Manager) suite. As its name implies, SVM is used to control storage virtualization tasks, such as creating or expanding volumes, creating snapshots and mirrors, and making full copies of virtual volumes.
Each SVM machine hosts the virtualization metadata for your environment and shares it with the Accelera boxes. It's important to note that in a Troika SAN, you configure the FC switches to prevent a direct connection between hosts and storage devices. In fact, the Accelera-SVM combo has full control over directing and dispatching data traffic, while the FC switches assume an ancillary role as data path devices.
I used two machines to simulate applications servers -- one running VMware ESX; the other, Windows 2000. To accommodate for fail-over, each server had dual FC HBAs, obviously linked to both switches, and the Windows box had installed multipath software.
Pulling the plug
My first tests aimed at stressing the SVS's fail-over capabilities. To check how the system handled broken links, I started Iometer on that Windows server to create some traffic and to simulate a running application. I then unplugged the FC cable between the Windows server and the QLogic switch.
Each host had a double access path to the storage array, so I expected the Accelera boxes to reroute the traffic seamlessly to the other path through the second switch. It took a few seconds, but I soon saw that the lights on the Brocade switch started to blink, a clear sign that the Accelera had automatically routed the traffic previously flowing through the QLogic box. My Iometer script never had a hiccup; nor should your applications.