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SAN Worst Practices 1: ISL R_RDY Mode
There is a function in FabricOS with a command name so unsuspicious and innocent you might want to enable it without even knowing what it does: portcfgislmode Now doesn't that sound like: "If you plan to attach an ISL to this port, enable me! Enable me and I will prepare this callow port to be a real E-Port." ? Well in some ears it seems to do so. But it's something... [More]
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Performance buffers for Brocade ISLs
Sometimes we notice that an ISL is actually a bottleneck in a fabric. Not a congestion bottleneck where the throughput demand is just too high for the ISL's bandwidth. This one could be solved by putting another cable between the both switches. But if you have a latency bottleneck your ISL won't be running at the maximum of the bandwidth. The contrary is the case: it lacks the buffer... [More]
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Of VCs and tunnels - Inside the SAN06B-R
I don't always write technical blog posts. But when I do I make them long and the conclusion contains a request to you my readers to do this or that. I won't do that today. Today is about a behavior I observed, but I won't propose anything. Feel free to draw your own conclusions. Well that might be considered as a proposal :o) This one is about the... [More]
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How to NOT connect an SVC in a core-edge Brocade fabric
In one of my previous posts I wrote about "Why inter-node traffic across ISLs should be avoided" . There is an additional "bad practice" that could lead to performance problems in the host-to-SVC traffic. Let's imagine a core-edge fabric. A powerful switch (or director) in its center is the core. The SVC and its backend storage subsystems are directly connected to it. Beside of... [More]
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