Work Slides
Later this week i'm presenting to my co-workers on benchmarking storage. As some of you may find them interesting, here is a pdf of the slides. The presentation assumes a rudimentary understanding of storage concepts and is only a 30 minute overview.
posted by francisco at 2/07/2010 12:51:00 PM
2 Comments:
Hi Francisco, I am enjoying reading your SAN benchmark slides. One thing that immediately jumped to mind when I was looking at your "Switch Tunables" slide is that Spanning Tree Protocol isn't mentioned. STP is not sexy and it's no surprise that most folks don't want to think about it. However, in my unfortunate experience, bridging problems, sometimes due to scary implementations in different brands of switching gear, are a very common cause of poor LAN performance.
Commonly even though a careful layer 3 or even VLAN topology was designed, the switches basically end up flooding. So instead of the lovely image in the designer's mind of frames carrying packets along in quick uniform order, the reality is that every frame is getting flooded out of every interface. Everything, all the time as Don Henley says.
Anyways food for thought, I will continue to enjoy absorbing the ideas in the rest of the paper. Buenos dias!
STP is definitely one of those config options that can screw up your network. It's also fun when your network admin mistypes netmasks.
Please note that my slides are by no means an exhaustive list; there are far too many knobs to turn on all devices in question.
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