Today I was following up on some harmless messages I have been seeing on some iSCSI Initiators I have setup that provide disk to a number of ESX servers over a Gigabit LAN. It appears that there may be some limitations running the newest flavour of ESX with current IET. One recent comment from an OpenFiler forum which implements a similar configuration to the one used on our Debian Lenny servers states very clearly that IET may not be robust enough to handle peak disk I/O on an optimized Gigabit LAN segment serving VMWare VSphere servers. This post by alhall explains a lot what people have been seeing in some other OpenFiler threads I have been reading today.
In any event, it also has my eye on SCST, another iSCSI subsystem, that is not as mature from a packaging perspective but appears to be a future contender based on the current feature comparison.
The bottom line here is to stick with ESX 3.x with IET for now. As a side note, there are a few IET.conf performance tweaks laid out nicely here with explanations on what each does.
