Also, if we have any kind of software (HUK, DSM, etc.) for host side, usually it just sets timeouts. It really is dependent on yoru specific OS and what it is running. I would get to a supported configuration, and if you really want to take a look it's best to oepn a support case. iSCSI failover should not take that long, but that tells me that the host isn't configured right possibly, not storage.