Hello Dan,   That first message is normal, as it's an INFO, not WARN or ERROR level message.  It only means that a connection was logged out so that it can be moved to a different port in the group.   I suspect you are running MEM?   That will move, start, stop iSCSI sessions as needed to keep the I/O balanced over the available ports on the arrays.    ESXi v5.x will always report any kind of connection issue as an error.  Even when it's expected like here.  EQL uses a mandatory iSCSI command known as "async logout"  To tell the iSCSI initiator to logout then go to the Discovery address and log right back in.  However, this time it will be moved to a different port on an array.   MEM periodically reviews the current connections and might decide to change the connection layout.  The 6100 is probably the Group Lead.  So it stores, and displays all messages from every member in the group.  Buried in the text it might show you that some are coming from the 4100.   The other message about the "6 sec timeout" is different.  That means that during that period the array could not reach that server.  Periodically, both initiator and EQL exchange keep alive timeout packets.  (KATO for short).   This makes sure that both are still responding.  If it fails several times, that message is displayed and the connection is terminated.  Once the initiator (server) is back it will open a new iSCSI session to replace it.   You see this message when you reboot a server, or there are issues with the network. If you are really concerned you can open a support case with Dell.  Please gather the array diags (all members), switch config logs, and VM supports from the ESXi nodes.   They can review this info and verity that the configuration is OK.    They can review the ESXI nodes to make sure they are in best practice compliance with Dell's best practices.   There is a Tech Report.   TR1091 that covers this.  You can find a copy here.  en.community.dell.com/.../download Many problems have been resolved by upgrading ESXi to current build, configured in accordance to that document and getting switches up to spec as well.    Also make sure the EQL array is running 6.0.7 or later.  Running current firmware is best though.  Earlier versions than 6.0.7 saw potential for VMFS Datastore corruption.  So it's very important to stay current.     Regards,   Don 
today all of a sudden equallogic group manager its getting flooded with  iscsi session target -- was closed -- logout request received from the initatior  iscsi session target -- was closed -- iscsi inittator connection fauilureno response on connection for 6 seconds  been trying to figure what changed since yesterday , nothing changed  the 4100 member not showing that info , all related to the 6100 member?  on the esxi 5.5 side its showing lost path , path restore error messages  any clues 
INFO iscsi session target -- was closed -- logout request received from the 
initatior