2009-03-05 06:49 AM
I am trying to grasp fractional reserve adn I am simulating this in my lab with a Windows machine connected to a iSCSI LUN on a Netapp.
How do I simulate overwriting a LUN? Because once the file system disk is full in my Windows disk, I cannot overwrite these blocks.
what I want to see is if I can overwrite as much as the fractional rserve is set at. My understanding is that if this is set at 50%, I can only overwrite 50% og the original LUN size.
2009-03-05 01:08 PM
You need to take a snapshot.
Write the volume full, then snapshot it, then remove and rewrite with fresh data. At this point, if you have set the fractional reservation to 50% and the volume size is thick provisioned at 150% of the LUN size, then you should run out of space! Depending on other factors, such as aggregate free space, will depend on how the LUN reacts to this.