I have added some iDRAC and my EqualLogic Group and i can see the log entries in vCenter Log Insight. You have to create a filter based on "source" and choose "start with" to search for IP, or when you have a working reverse DNS, or the FQDN.
If you mark something in the text output you can extract a field to create a new group filter. I didnt find out how to use this in a custom dashboard but i dont havent take a look into the manual yet.
16040:9263:MgmtExec:16-Jun-2013 15:33:36.224028:targetAttr.cc:775:INFO::7.2.47:iSCSI login to target '172.22.149.xxx:3260, iqn.2001-05.com.equallogic:0-8a0906-dd2ab870c-f060017cd8750d06-grp-01-003-l' from initiator '172.22.149.xxx:61691, iqn.2011-08.local.example:esx-node-99' successful using standard-sized frames. NOTE: More than one initiator is now logged in to the target.
Regards,
Joerg