In actual throughput testing, Mason adds, the SmartBits system would be configured using multiple modules. For example, a customer might set up a test emulating 15 to 20 switches on each of five modules.
Besides discovering that none of the Fibre Channel vendors' switches could support anything close to a 239-switch SAN, Spirent also found that certain products were simply awful at recovering from major fabric disruptions. In one test, Spirent simulated an outage that took down five switches -- and the rest of the switches in the fabric required 20 seconds to reconverge. That's a process that should normally be measured in milliseconds.
Unfortunately, Mason wouldn't tell us which vendor's switches had performed so horribly. We're pretty sure one of its competitors would be willing to share this information at some point... unless, of course, every Fibre Channel switch suffers from the same glitch.
Todd Spangler, US Editor, Byte and Switch
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