very little happending in vmkernel.log at time of disconnect
2013-01-17T13:41:03.815Z cpu5:5120)Config: 347: "VMOverheadGrowthLimit" = 0, Old Value: -1, (Status: 0x0)
2013-01-17T13:41:04.613Z cpu6:7914)Config: 347: "HostLocalSwapDirEnabled" = 0, Old Value: 0, (Status: 0x0)
2013-01-17T13:42:23.730Z cpu0:4104)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007d33c0, 0) to dev "mpx.vmhba0:C0:T0:L0" on path "vmhba0:C0:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:42:23.730Z cpu0:4104)ScsiDeviceIO: 2316: Cmd(0x4124007d33c0) 0x1a, CmdSN 0x1e36 from world 0 to dev "mpx.vmhba0:C0:T0:L0" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:42:23.754Z cpu5:4101)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007d33c0, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T8:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:42:23.754Z cpu5:4101)ScsiDeviceIO: 2316: Cmd(0x4124007d33c0) 0x1a, CmdSN 0x1e38 from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:42:24.389Z cpu1:7841)Config: 347: "VMOverheadGrowthLimit" = -1, Old Value: 0, (Status: 0x0)
2013-01-17T13:43:03.680Z cpu7:5167)Config: 347: "VMOverheadGrowthLimit" = 0, Old Value: -1, (Status: 0x0)
2013-01-17T13:43:04.475Z cpu1:7841)Config: 347: "HostLocalSwapDirEnabled" = 0, Old Value: 0, (Status: 0x0)
2013-01-17T13:44:21.227Z cpu4:5123)Config: 347: "VMOverheadGrowthLimit" = -1, Old Value: 0, (Status: 0x0)
2013-01-17T13:45:04.135Z cpu2:7914)Config: 347: "VMOverheadGrowthLimit" = 0, Old Value: -1, (Status: 0x0)
2013-01-17T13:45:04.927Z cpu7:7925)Config: 347: "HostLocalSwapDirEnabled" = 0, Old Value: 0, (Status: 0x0)
2013-01-17T13:47:23.746Z cpu2:4098)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007c3d00, 0) to dev "mpx.vmhba0:C0:T0:L0" on path "vmhba0:C0:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:47:23.746Z cpu2:4098)ScsiDeviceIO: 2316: Cmd(0x4124007c3d00) 0x1a, CmdSN 0x1e5b from world 0 to dev "mpx.vmhba0:C0:T0:L0" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:47:23.771Z cpu4:4100)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007c3d00, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T8:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:47:23.771Z cpu4:4100)ScsiDeviceIO: 2316: Cmd(0x4124007c3d00) 0x1a, CmdSN 0x1e5d from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:52:08.507Z cpu4:4100)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x85 (0x4124007a3240, 5214) to dev "naa.6001e4f01d7de30017a27f5a7af7e639" on path "vmhba1:C2:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:52:08.507Z cpu4:4100)ScsiDeviceIO: 2316: Cmd(0x4124007a3240) 0x85, CmdSN 0x93 from world 5214 to dev "naa.6001e4f01d7de30017a27f5a7af7e639" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:52:08.507Z cpu4:4475)ScsiDeviceIO: 2316: Cmd(0x4124007a3240) 0x4d, CmdSN 0x94 from world 5214 to dev "naa.6001e4f01d7de30017a27f5a7af7e639" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:52:08.507Z cpu4:4475)ScsiDeviceIO: 2316: Cmd(0x4124007a3240) 0x1a, CmdSN 0x95 from world 5214 to dev "naa.6001e4f01d7de30017a27f5a7af7e639" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
2013-01-17T13:52:23.761Z cpu5:4101)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007c4000, 0) to dev "mpx.vmhba0:C0:T0:L0" on path "vmhba0:C0:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:52:23.761Z cpu5:4101)ScsiDeviceIO: 2316: Cmd(0x4124007c4000) 0x1a, CmdSN 0x1e69 from world 0 to dev "mpx.vmhba0:C0:T0:L0" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-01-17T13:52:23.786Z cpu5:4101)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124007c4000, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T8:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-01-17T13:52:23.786Z cpu5:4101)ScsiDeviceIO: 2316: Cmd(0x4124007c4000) 0x1a, CmdSN 0x1e6b from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
those errors are local disk, two SAS disks as RAID1 which are not used, and those errors could have always been there.
at time of disconnect nothing