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 and the misunderstanding of the [...]
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 RAID levels would do [...]
I was just reading the excellent whitepaper that NetApp just published. The paper is titled “VMware vSphere multiprotocol performance comparison using FC, iSCSI and NFS“. I guess the title says enough and I don’t need to explain why it is important to read this one. I read the paper twice so far. Something that stood out for me is the [...]
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Just a short article for today, or should I call it a tip. Take your memory configuration into account for Nehalem processors. There’s a sweet spot in terms of performance which might just make a difference. Read this article on Scott’s blog or this article on Anandtech where they did measure the difference in performance. Again it is not a [...]
Just something I wanted to document for myself as it is info I need on a regular basis and always have trouble finding it or at least finding the correct bits and pieces. I was more or less triggered by this excellent white paper that Herco van Brug wrote. I do want to invite everyone out there to comment. I [...]
This week we(Frank Denneman and I) played around with vscsiStats, it’s a weird command and hard to get used to when you normally dive into esxtop when there are performance issues. While asking around for more info on the metrics and values someone emailed us nfstop. I assumed it was NDA or at least not suitable for publication yet but [...]
