vmkernel log shows this
222e1da31f6a4073778" failed H:0x2 D:0x0 P:0x0 Possible sense data: 0x6 0x29 0x0.
2013-01-16T07:33:55.385Z cpu4:8374)ScsiPath: 3531: Command 0x0 (cmdSN 0x0, World 0) to path vmhba32:C3:T0:L2 timed out: expiry time occurs 568ms in the past
2013-01-16T07:33:55.461Z cpu7:8199)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x28 (0x4124003e15c0, 0) to dev "naa.6486fd2401083222e1da31f6a4073778" on path "vmhba32:C3:T0:L2" Failed: H:0x2 D:0x0 P:0x0 Possible sense data: 0x6 0x29 0x0. Act:EVAL
2013-01-16T07:33:55.585Z cpu6:8814)iscsi_vmk: iscsivmk_ConnNetRegister: socket 0x41001bade4b0 network resource pool netsched.pools.persist.iscsi associated
2013-01-16T07:33:55.585Z cpu6:8814)iscsi_vmk: iscsivmk_ConnNetRegister: socket 0x41001bade4b0 network tracker id 1 tracker.iSCSI.10.60.1.107 associated
2013-01-16T07:33:55.604Z cpu7:8199)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x28 (0x4124003e15c0, 0) to dev "naa.6486fd2401083222e1da31f6a4073778" on path "vmhba32:C3:T0:L2" Failed: H:0x2 D:0x0 P:0x0 Possible sense data: 0x6 0x29 0x0. Act:EVAL
2013-01-16T07:33:55.746Z cpu7:8199)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x28 (0x4124003e15c0, 0) to dev "naa.6486fd2401083222e1da31f6a4073778" on path "vmhba32:C3:T0:L2" Failed: H:0x2 D:0x0 P:0x0 Possible sense data: 0x6 0x29 0x0. Act:EVAL
2013-01-16T07:33:55.819Z cpu7:8199)WARNING: NMP: nmp_DeviceRequestFastDeviceProbe:237:NMP device "naa.6486fd2401083222e1da31f6a4073778" state in doubt; requested fast path state update...
2013-01-16T07:33:55.840Z cpu6:8814)WARNING: iscsi_vmk: iscsivmk_StartConnection: vmhba32:CH:3 T:0 CN:0: iSCSI connection is being marked "ONLINE"
2013-01-16T07:33:55.840Z cpu6:8814)WARNING: iscsi_vmk: iscsivmk_StartConnection: Sess ISID: 00023d000006 TARGET: iqn.2009-10.net.storsimple:CSASHU0963636L6914 TPGT: 1 TSIH: 0
2013-01-16T07:33:55.840Z cpu6:8814)WARNING: iscsi_vmk: iscsivmk_StartConnection: Conn [CID: 0 L: 10.60.1.212:52067<http://10.60.1.212:52067> R: 10.60.1.107:3260<http://10.60.1.107:3260>]
2013-01-16T07:33:55.846Z cpu10:8202)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x28 (0x4124003e15c0, 0) to dev "naa.6486fd2401083222e1da31f6a4073778" on path "vmhba32:C3:T0:L2" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x6 0x29 0x0. Act:NONE
2013-01-16T07:33:55.846Z cpu10:8202)ScsiDeviceIO: 2316: Cmd(0x4124003e15c0) 0x28, CmdSN 0x6ae from world 0 to dev "naa.6486fd2401083222e1da31f6a4073778" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x6 0x29 0x0.
2013-01-16T07:33:55.846Z cpu10:8202)ScsiCore: 1483: Power-on Reset occurred on naa.6486fd2401083222e1da31f6a4073778