Cloning virtual machines is an area where VAAI can provide many advantages. Flash storage arrays provide excellent IO performance. We wanted to see what difference VAAI makes in virtual machine cloning operations for “All Flash Arrays”.
For the test 500GB of random data on a VMDK was created on a Linux virtual machine. This virtual machine was then cloned with VAAI turned off and then on to study its impact. The results of the testing truly attest to the big benefits that VAAI bring to massive write operations.
There is no doubt that the barriers to virtualization have been rapidly falling. In fact today with VMware’s Monster VM capabilities and the scalability of vSphere 5.5, many organizations have recognized that practically any application can be virtualized and they have adopted a virtualization first policy. But there are still some customers that have been hesitant about virtualizing their most critical applications. Often times I/O bottlenecks and high storage latency are the cause for poor application performance. That is where a new breed of storage comes to the rescue.
I’ve been involved recently in a couple situations in which the ‘preferHT’ advanced setting has been implemented, but for the wrong reasons. I want to re-clarify how and when it should be used. As with many advanced settings, it can be helpful or hurtful.
“PreferHT exposes Hyper-Threading to the guest operating system” – False!
The VMware Mobile Knowledge Portal iOS and Android app has recently been updated. It sports a great new look and feel and makes finding the information you need even easier by grouping it by area in our SDDC vision.
More recent versions of Microsoft operating systems contain the ability to detect if they are running virtualized or not. This is accomplished through the checking of a CPUID hypervisor-present bit presented by the VMware virtual hardware. Since virtual hardware 7, VMware has implemented this interface, which is required by the Microsoft SVVP program.
However, as Microsoft continues to change and update its specifications, lets look at a specific behavior in which virtual machine performance can be impacted by the operating system accessing a time source inefficiently. Continue reading →