[SOLVED] iSCSI read errors during iPXE boot

[tlum]

I did read that, and more, and it didn't help, since I believed it was correct, since the target was responding with a "Test Unit Ready" Success, and other indications that I was hitting the correct LUN, and in addition to expecting it to cry if it's wrong because that initiators acls only has that that one LUN.

What adds to the confusion is that the Target has a dozen LUNs, but the Initiators all do a discovery and then automatically create sequential block devices, like:

client1
LUN3 = /dev/sda, LUN7 = /dev/sdb

client2
LUN5 = /dev/sda, LUN8 = /dev/sdb

So, it's easy to fall into the trap of thinking of the first device as being relative to the first LUN assigned to the initiators iqn. But that's not the case, iPXE wants the actual Target LUN #, and not a 0 based index relative to the initiators iqn acl. So in order to, "Make sure you connect to the correct LUN on the iscsi target", you first have to be exceptionally clear on exactly what the means.