Category Archives: Fibre Channel

Why frames get dropped at your storage array

Arrays from all vendors have significant troubleshooting capabilities but in most cases these are scambled in the most obscure way you can imagine. You need special tools to...

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Fibre Channel, Troubleshooting , ,

Time to rethink your zoning strategy –peerzones

With the advance of the FC-GS and FC-SW protocols the change, or more the enhancement, of being able to use Target Driven Zoning provided Brocade with the option [..]

Brocade, Brocade Technical, Fibre Channel, Storage Networking , , , , , , ,

Why FDMI is compulsory (or should be!!)

FDMI stands for Fabric Device Management Interface and is such an enormously cool feature and unfortunately one of the least used. From an operational management perspective FDMI provides [..]

Brocade, Brocade Technical, Fibre Channel, Storage Networking , , ,

Port stuck in L-port mode

So now and then you run into this issue where, no matter which configuration you try, a switch port always shows:   86   10    6   3a5600   id    N8   [..]

Brocade, Fibre Channel , ,

Signal quality and link stability

I really think I should stop with fillword discussions but here is one more. What happens even if you have set the correct fillword, have made sure all...

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Brocade, Fibre Channel, Storage Networking, Troubleshooting , , , , ,

Fillwords IDLE vs ARBff (one last time)

I’ve written about fillwords a lot (see here, here, and here) but I didn’t show you much about the different symptoms an incorrect fillword setting may incur. As...

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Fibre Channel, Storage Networking, Troubleshooting , , , , , , ,

Speed mismatch is the death-trap for shared storage

I’ve been focusing on the implications of physical issues a lot in my posts over the last ~2 years. What I haven’t touched on is logical performance boundaries...

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Fibre Channel, Storage Networking, Troubleshooting , , ,

Energy Efficient Fibre Channel and related cost savings

For years many storage environments have used both active-active and active-passive multipath (MPIO) access mechanisms to access storage arrays in a dispersed or linear method. On enterprise class [..]

Fibre Channel , , , , , ,

Time with and without NTP on FC switches

I’ve been writing about troubleshooting issues for a while now and one of the things that is very difficult and most time consuming is correlating events between host...

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Brocade, Cisco, Fibre Channel, Storage Networking, Troubleshooting , , , , , ,

FC Frame header, or is there more to it

The FC frame header has not changed since its inception back in the late 80-ies. This shows the absolute rock-solid backward compatibility towards previous generation platforms and vendors. [..]

Fibre Channel, Storage Networking , ,