One of the most promising blogs of this moment is definitely Frank Denneman‘s blog. Frank is a freelance consultant with a focus on virtualization and storage. His latest addition “Increasing the queue depth” is an excellent article and really shows that Frank knows what he’s talking about!
When it comes to IO performance in the virtual infrastructure one of the most recommended “tweaks” is changing the Queue Depth (QD). But most forget that the QD parameter is just a small part of the IO path.
The IO path is made up of layers of hardware and software components, many of which can have a huge impact on the IO performance. The best results are achieved when the whole system is analysed and not just the ESX host alone.
I’m not going to copy and paste his entire article of course. Head over to his website and start reading. I can also recommend these articles: SRM and HP Continous Access DR Group Design and HP CA and the use of lun load balancing scripts. Don’t forget to bookmark the site or add it to your rss reader!