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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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Brocade Fabric OS v7.1 in the eyes of a troubleshooter
To like working in tech support, you have to be the most optimistic guy around. You have to be even more optimistic about the product you support than the sales guy trying to sell it. Why? Because the product can be as fantastic as possible - jam-packed with jaw-dropping features - as a tech support guy you will only witness the bugs. However, the bugs are not what's annoying me. Well, at least... [More]
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Stuck VCs or why my switch began to nag?
Reach this article at https://ibm.biz/stuckvc . It's summertime again and for some of our customers it's the time to do their Fabric OS updates. Maybe you want to do that, too? I personally recommend a six month interval to go to the latest or the latest "mature" code, depending on your policy. When you update to one of the latest v6.3x, v6.4x or v7x codes you might see... [More]
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SAN Myths Uncovered: Quality of Service in Brocade FabricOS
When Brocade released FabricOS v6.0 in 2007 Quality of Service sounded like a great idea: It allows you to prioritize your traffic flow to the level of certain device pairs. There are 3 levels of priority: High - Medium - Low Inter Switch Links (ISLs) are logically partitioned into 8 so called Virtual Channels (VCs). Basically each of them has its own buffer management and the decision which... [More]
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Things I like in Brocade FOS 7.0 - Part 3: Little helpers
There are some goodies in FOS 7.0 that are not announced big-time. Goodies especially for us troubleshooters. There are regular but not too frequent so called RAS meetings. Here we have the possibility to wish for new RAS features - wishes born out of real problem cases. Some of the wishes we had were implemented in FOS 7.0 (beside of the Frame Log I already described in a previous post). ... [More]
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Things I like in Brocade FOS 7.0 - Part 2: The Frame Log
Time for another piece of my little series ! This time I'd like to write about a new feature in v7.0x especially for administrators and support personnel: The Frame Log. Maybe it's a bit early to write about it, because it seems to be a feature "in development" at the moment, but I did wait for it so long I'm just not able to resist. I think and I hope Brocade will further develop it like the... [More]
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Things I like in Brocade FOS 7.0 - Part 1: The D-Port
Brocade recently released its 16G platform switches and along with them a new major version of FabricOS: FOS 7.0. Beside the new features customer's admins, architects or end-users might be interested in, I see some nice enhancements and new tools for us support people, too. In the next blog posts I would like to present some of them and show how to use them, why they are important and where they... [More]
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