Today I was fooling around with my new Lab environment when I noticed my Path Selection Policy (PSP) was set to fixed while the array (Clariion CX4-120) most definitely supports Round Robin (RR). I wrote about it in the past(1, 2) but as with vSphere 4.1 the commands slightly changed I figured it wouldn’t hurt to write it down again: [...]

I was troubleshooting VMware Data Recovery today and found an interesting article in the VMware KB for enabling verbose logging for Data Recovery through the GUI instead of by modifying the datarecovery.ini: To view Verbose Data Recovery logs: In the vSphere Client, select Home > Solutions and Applications > VMware Data Recovery. Enter the virtual machine name or IP address of the backup [...]

I was asked why Data Recovery was only running one single job at a time instead of multiple concurrent. After some investigations I found out that the administrator changed the configured memory for the appliance to 8Gb where 2Gb is the default. The Knowledge base article clearly states the following about this: This issue may occur if the configuration of [...]

Back in the days when Servers still had 8GB or 16GB memory at most a setting was introduced that guaranteed the hypervisor had a certain amount of free memory to its disposal. The main purpose of this being of course stability of the system. As with any Operating System free memory is desirable to ensure it is available whenever a [...]

After 14 emails with absolutely no reply whatsoever our book, vSphere 4.1 HA and DRS Technical Deepdive, popped up on both the German and UK version of Amazon. For those who haven’t ordered it yet through comcol.nl you can also get it here: Amazon.de Amazon.co.uk Sorry about the delay and I hope they will continue selling it for a very [...]

Not sure where this discount is coming from but I figured I would share it with you. You can pick up the vSphere 4.1 HA and DRS Tech Deepdive for $ 17.96 on Amazon.com. That is about as cheap as it can ever get in my opinion. Pick it up. By the way, Frank and I are working on a [...]

I’ve seen this myth floating around from time to time and as I never publicly wrote about it I figured it was time to write an article to debunk this myth. The question that is often posed is if thin disks will hurt performance due to fragmentation of the blocks allocated on the VMFS volume. I guess we need to [...]