I should add that I have six hosts accessing five SANs, and each are having these problems. The problems don't point to a single host or SAN, so I'm thinking there's a network issue or common configuration issue among all the hosts. I appreciate you helping me through this. Testing will be performed on a single host then replicated to others as progress is made.
I'm able to ping each interface on each SAN (four each on five SANs).
I tried telnet to a few of the interfaces and the connection timed out without giving a login prompt. I don't see in SANtricity if there's an option to enable telnet anywhere.
Discovered targets in iSCSI Initiator all show connected. All attached LUN's are accessible on the hosts. I just seems that there are network blips causing this issue.
All hosts are connected to the SANs via NIC teaming. Are there NIC settings to be considered?
"Port channels/LACP is not supported on the controller's switch ports. Host-side LACP is not recommended; multipathing provides the same, and in some cases better, benefits."
Another thing worth checking is if the hosts, switches and SANs are all set up to use the same MTU size. Jumbo frames are not required, but if the host and SAN do not agree on MTU size, fragmentation occurs causing slower performance and sometimes momentary blips on the connection.