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SAN Worst Practices 1: ISL R_RDY Mode

seb_ Tags: fabos discards channel isl vc worst brocade fabricos performance c3_discard timeout r_rdy credits practice vc_rdy fos b_type virtual ‎ 3 Comments ‎ 16,289 Views

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,...

from Blog: seb's sanblog

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Performance buffers for Brocade ISLs

seb_ Tags: isl vc portcfgeportcredits credit qos channel san virtual troubleshooting brocade buffer holb performance ‎ 11 Comments ‎ 38,944 Views

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...

from Blog: seb's sanblog

Modified on by seb_

Of VCs and tunnels - Inside the SAN06B-R

seb_ Tags: credits vc fc virtual bottleneck brocade fcr router routing channel fcp fcip buffer san ‎ 2 Comments ‎ 19,338 Views

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...

from Blog: seb's sanblog

Modified on by seb_

SVForum’s Venture Finance and Startup SIG and the IBM Innovation Center in Silicon Valley

AngieK Tags: global startup sviic vc entrepreneur ‎ 1 Comment ‎ 8,516 Views

On Monday November 11 SVForum’s Venture Finance and Startup SIG and the IBM Innovation Center in Silicon Valley co-hosted an interactive panel discussion about what really goes on between a VC and a startup company before, during and after the financing...

from Blog: IBM Innovation Center Silicon Valley

How to fight back pressure against an appliance in a core edge fabric

seb_ Tags: vc performance buffers brocade appliance hold_time asic frame svc san buffer_credits core edge ‎ 4 Comments ‎ 25,396 Views

A slow drain device often has a huge impact on the performance of many other devices in a SAN environment. That happens, because they block resources in a fabric other devices use as well. The main example for such a resource are ISLs, particularly the Virtual...

from Blog: seb's sanblog

Stuck VCs or why my switch began to nag?

seb_ Tags: bottleneckmon stuck_vc vc fabricos brocade backlink vc_rdy r_rdy fabos ‎ 8 Comments ‎ 33,015 Views

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...

from Blog: seb's sanblog

Modified on by seb_

How to NOT connect an SVC in a core-edge Brocade fabric

seb_ Tags: vc edge performance brocade longdistance svc channel isl virtual san core le san_design ‎ 18 Comments ‎ 43,320 Views

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...

from Blog: seb's sanblog

Profitero wins IBM Startup SmartCamp London, England Community Blog

Frank_Carlos Tags: app funding vc smarterplanet entrepreneur tech startup smarter ibm social web ‎ 18,478 Views

Calling All Startups Your Startup idea could win it all at IBM Entrepreneur SmartCamp Sign-Up today IBM SmartCamp Winners, Schedule and Tips Learn about the 2011 IBM Startup SmarCamp City winner of Bangalor India , and the winner of...

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