Installed 3.0.2 on a pair of Dell 2950s with an EMC NS40 a couple of weeks ago. We set it up completely iSCSI and are using software initiators. Everything was great until Friday. I put one of the servers into maintenance mode and rebooted it. When it came back up, it's target had disappeared!! Rescan does nothing. Reboot does nothing. What did I do? Eeek!!
Also wondering if you configured CHAP?
Check to make sure the port 3260 is still open in the Security Profile.
Still open.
Can you reach the iscsi target with a vmkping from the SC?
Also wondering if you configured CHAP?