Did a couple of upgrades from 3.1.3 MU1 to 3.2.1 MU1 with P04 and notice a completely different issue with iSCSI.
shownet -d is some issues on the iSCSI interfaces
Code:
Detailed Tcp stats on node 0
RtoAlgorithm: 1 RtoMin: 200
RtoMax: 120000 MaxConn: -1
ActiveOpens: 6717 PassiveOpens: 6768
AttemptFails: 33 EstabResets: 97
CurrEstab: 89 InSegs: 1111778630
OutSegs: 496370425 RetransSegs: 389274
InErrs: 0 OutRsts: 40
Detailed Tcp stats on node 1
RtoAlgorithm: 1 RtoMin: 200
RtoMax: 120000 MaxConn: -1
ActiveOpens: 39513 PassiveOpens: 77477
AttemptFails: 164 EstabResets: 41280
CurrEstab: 99 InSegs: 1105276422
OutSegs: 501448361 RetransSegs: 1165450
InErrs: 0 OutRsts: 6799
10 seconds later
Code:
Detailed Tcp stats on node 0
RtoAlgorithm: 1 RtoMin: 200
RtoMax: 120000 MaxConn: -1
ActiveOpens: 6717 PassiveOpens: 6768
AttemptFails: 33 EstabResets: 97
CurrEstab: 89 InSegs: 1111782268
OutSegs: 496375134 RetransSegs: 389276
InErrs: 0 OutRsts: 40
Detailed Tcp stats on node 1
RtoAlgorithm: 1 RtoMin: 200
RtoMax: 120000 MaxConn: -1
ActiveOpens: 39513 PassiveOpens: 77477
AttemptFails: 164 EstabResets: 41280
CurrEstab: 99 InSegs: 1105280815
OutSegs: 501452729 RetransSegs: 1165505
InErrs: 0 OutRsts: 6799
The above is from a 2-node 7400, also seeing similar issues on a pair of 7200's though the counts are less (much smaller configs).
Just ran across the issue a few hours ago when the VM farm disconnected/reconnected half of the exported LUNs....definitely something is up.