Hi Graeme,   Thank you for the update ,i have opened a case with EMC and after analyzed the logs they have conformed me incident was happen due to network ports down and up which are connected to storage .   Thank you vajrala
Hi All, In my Environment have VNXe3100 running with software version:2.3.1.19462 .In midnight suddenly for all servers unreachable to storage device around 1 hour .   In Network end ------------------------ we have observed switch ports was  down and up which are connected to storage device in the same time  In Storage end  -------------------------- Observed  in storage Event log as "Storage servers configured for SPA have stopped and will be back"  And In logs I observed many Critical alerts related to "unknown component found" ,"ALL luns was trespassed to SPA"," Vnic ports down and up" ,"virus checker not started" ,"then ALL Luns was trespassed to SPB" .   In server end  -------------------------- iSCSI connection failed to connect target  and reconnected this was happen 3 to 4 time in a hour  .     After all this was happen storage LUNS are connected to servers.   I was wondering why this was happened ,Please help me out  why this was happen .   Thank you in advance  Vajrala  
Multiple critical alerts in VNXe 3100 log file related to "unknown component 
found" ,"ALL luns was trespassed to SPA"," Vnic ports down and up" ,"virus 
checker not started" ,"then ALL Luns was trespassed to SPB" .