I have a Dell PS6100 that we use for our VM storage. I had one of our contracted techs tell me today that by setting Snapshot reserve to 0% (we don't use them), that he learned in his Dell class years ago that this would cause "a drop in IOP performance".

This sounds like gabarge to me. I've disabled snapshots on SANs before in the past and never seen a performance hit or ever heard of that being the case. Technically it doesn't make sense to me. Thought I would double check though as I've been wrong before. Thoughts?