Category Archives: Troubleshooting

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 , ,

Reset the Zoning Configuration and Prevent Mistakes.

There are occasions where you need to remove an entire zoning configuration from a switch. One of them is if you need to add a switch to an...

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Brocade Technical, Troubleshooting , , , ,

Appalling state of Storage Networks

In the IT world a panic is most often related to a operating systems kernel to run out of resources or some unknown state where it cannot recover...

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Brocade, Troubleshooting , , , , , , , ,

Upgrade to FOS 7.4.x fails due to APM performance monitors

As I’ve written before some features in FOS 7.3 and older have been superseded by new tools such as MAPS and FlowVision. On of those is also Advanced...

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Brocade, Troubleshooting , , , , , , ,

Open Source Software (OSS) and security breaches in proprietary firmware

It is no secret that many vendors use open source software in their products and solutions. One of the most ubiquitous  is Linux which is often the base...

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Brocade, Brocade Technical, Cisco, Troubleshooting , , , , ,

Performance misconceptions on storage networks

The piece of spinning Fe3O4 (ie rust) is by far the slowest piece of equipment in the IO stack. Heck, they didn’t invent SSD and Flash for nothing,...

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Linux, Storage, Troubleshooting , , , , ,

Brocade “compatible” SFP’s will disrupt your fabric.

As with all good stuff there are always people and companies that try to jump on the bandwagon and make some dollars by using cheap kit and sell...

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Brocade, Troubleshooting , , , , ,

Brocade Network Advisor Performance Graphs flatline

One of the regularly used features in BNA is the ability to retain performance numbers and a history of port errors. It is then most annoying when these...

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Brocade, Troubleshooting , , , , , , ,

Port counters may be flawed.

As a support-guy you very often look at port counters. These do not only provide insight into the status of a port but also may give statistical information...

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Brocade, Storage Networking, Troubleshooting , ,

Cross-fabric collateral damage

Ever since the dawn of time the storage administrators have been indoctrinated with redundancy. You have to have everything at least twice in order to maintain uptime and...

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Storage Networking, Troubleshooting , , , , , ,