I know that eager zero disk are supposed to have the best performance, but for thin provisioned disks, after the initial write penalty, is there still a performance impact or is it the same as thick?
I seem to recall reading somewhere that after the first write, there is no difference in performance between thick/thin disks but I can't find that page anymore. I am imagining things or is that the case?
What about allocation on a SAN? Does a thick provisioned disk have a better chance of having it's blocks close to each other vs. thin provisioned where it ends up scattered all over the disk making it "longer" to do all the read/writes? I realize with VMs that a sequential read/write probably looks like a random one by the time it gets to the storage with the requests for all the other vms, but is there any validity to thinking that thick provisioned disks might have their blocks less spread out and hence, faster disk access?
Thanks