I’ve done a lot of training courses in my career. A lot of them were disappointing as they never met my expectations. I guess the ones that did meet my expectations, or even exceeded them, were mainly VMware related. Especially the DSA course rocked. But there’s a new training in town, and it just claimed [...]
Posts Tagged ‘performance’
Reclaiming idle memory
March 11th, 2010
7 Comments
In the “CPU/MEM Reservation Behavior” article there was a lively discussion going on between Chris Huss(vmtrainers.com) and myself. I think the following comment by Chris more or less summarizes the discussion
I wasn’t aware that the balloon driver was involved with the Mem.IdleTax. I haven’t seen any documentation stating this…and assumed that the VMkernel just stopped [...]
E1000 and dropped rx packets
February 2nd, 2010
8 Comments
At a customer site we received several notifications of performance issues with a VMware VI3 environment. After having checked the configuration of the VMs and the Hosts we decided to dive into esxtop. At first sight we did not see any abnormalities. Low %RDY, which is usually the first thing I check, some swapping but [...]
Not al compute units are equal
January 14th, 2010
5 Comments
I was just reading an article which is titled “Surprise! Not all Amazon EC2 compute units are created equal. I think it’s a very interesting article and actually shows how people think/feel about what cloud computing is offering. In this case it’s all about the perception and as with many users the perception of performance [...]
Real life RAID penalty example added to the IOps article
January 11th, 2010
6 Comments
I just added a real life RAID penalty example to the IOps article. I know Sys Admins are lazy, so here’s the info I just added:
I have two IX4-200Ds at home which are capable of doing RAID-0, RAID-10 and RAID-5. As I was rebuilding my homelab I thought I would try to see what changing [...]
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