**disclaimer: this article is an out-take of our book: vSphere 5 Clustering Technical Deepdive** There’s a cool and exciting new feature as part of Storage vMotion in vSphere 5.0. This new feature is called Mirror Mode and it enables faster and highly efficient Storage vMotion processes. But what is it exactly, and what does it replace? Prior to vSphere 5.0 [...]
Last week I wrote about the different datamovers being used when a Storage vMotion is initiated and the destination VMFS volume has a different blocksize as the source VMFS volume. Not only will it make a difference in terms of reclaiming zero space, but as mentioned it also makes a different in performance. The question that always arises is how [...]
I received a very good question this week to which I did not have the answer, I had a feeling but that is not enough. The question was if Storage vMotion would be “throttled” by Storage IO Control. As I happened to have a couple of meetings scheduled this week with the actual engineers I asked the question and this [...]
I received a bunch of questions around storage masking over the last couple of weeks. One of them was around VMware’s best practice to mask LUNs on a per cluster basis. The best practice has been around for years and basically is there to reduce conflicts. More hosts accessing the same LUNs means more overhead, just to give you an [...]
I received this question a couple of times and there’s no real definitive answer written anywhere… “Does storage vmotion require additional disk space on the source volume?” The answer is: Yes it does. Storage VMotion uses the snapshot technology to release the lock on the source disk. This snapshot is placed on the source volume. So in other words, all [...]
VMware justed added a new KB article about problems with Storage VMotion script: Storage VMotion can fail for a virtual machine with the error message: Failed to unstun VM after disk reparent. The virtual machine is partially migrated and powered off. Generally, the virtual machine cannot be powered on again. This issue affects: Virtual machines converted in-place (not deployed or [...]
When using vmpmotion.pl on Windows with the RCLI installed you will need to set some extra environment variables before the script will work. First besure that the Perl filetype is correctly setup.
