I have servers running a few different iSCSI SAN units. I was trying to balance IO requests to the datastores, so I started changing the "Limit - IOPS" on my servers from unlimited to 100-400 depending on what the servers role is.
In doing this, it causes that specific VM to run VERY slowing. For exsample "unlimited" IOPS, IE will open in 1 second. Iops limited to 150, IE will take 10-12 or more to open on that server. I have verified this to be a issue on two completely different iSCSI SAN units as well.
Any ideas what I am doing wrong.