End of 2009, beginning of 2010 I put an Iomega StorCenter IX4 to the test and published the results in these two blogposts: Putting your storage to the test – Part 1 iSCSI on Iomega StorCenter IX4-200D and part 2. Recently Iomega sent me their new StorCenter PX4-300R for testing purpose and I was happy […]
performance
VKernel presents vOperations Suite 4
In June 2011 I was part of the TechField Day #6 delegation and one of the companies we visited was VKernel. During the VKernel presentation we, the delegates, had a number of comments on the layout / GUI part of vOPS. Only a few months later, VKernel shows they have been using our feedback and […]
Memory management and compression in vSphere 4.1
With vSphere 4.1, VMware released a great new feature called Memory compression. At first, after reading the release notes I thought memory compression was just one step before swapping to disk would occur. However, after reading the whitepaper “Understanding Memory Resource Management in VMware ESX 4” I learned some more details I want to share […]
Converting vscsiStats data into Excel charts
Some time ago I wrote a posting on how to use vscsiStats to gather even more data from your VMs and their SCSI performance ( See: Using vscsiStats – the full how-to). Last week I received an e-mail from Paul Dunn who had written an Excel macro that can read the output from the vscsiStats […]
Memory overcommit in production? YES YES YES
There was a good discussion on twitter on memory overcommit and the value of memory overcommit and whether you should or should not use it in production. What struck me in this was that on a subject like this, there is so much misunderstanding although there is a lot of documentation available that can explain […]