This issue re-occurred yesterday for us. I don't see an option to upload a file, so here is an excerpt from the time of the issue. The bold line is the nic that failed, but I'm not sure what the error is implying. Any help would be appreciated.
2013-08-26T20:30:46.042Z cpu1:10740)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x412400e5e680, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T20:30:46.042Z cpu1:10740)ScsiDeviceIO: 2316: Cmd(0x412400e5e680) 0x1a, CmdSN 0x1026c from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T20:32:51.523Z cpu20:10207)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x85 (0x4124403ea140, 9453) to dev "naa.690b11c006833a00183e6af116f473d2" on path "vmhba1:C2:T1:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T20:32:51.523Z cpu20:10207)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x85, CmdSN 0x4890 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T20:32:51.523Z cpu20:10207)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x4d, CmdSN 0x4891 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T20:32:51.523Z cpu20:10207)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x1a, CmdSN 0x4892 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
2013-08-26T20:32:51.529Z cpu20:8634)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x85 (0x4124403ea140, 9453) to dev "naa.690b11c006833a00183e5eb508bcdd7d" on path "vmhba1:C2:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T20:32:51.529Z cpu20:8634)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x85, CmdSN 0x4893 from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T20:32:51.529Z cpu20:8634)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x4d, CmdSN 0x4894 from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T20:32:51.529Z cpu20:8634)ScsiDeviceIO: 2316: Cmd(0x4124403ea140) 0x1a, CmdSN 0x4895 from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
2013-08-26T20:40:46.045Z cpu8:10738)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x412403b18880, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T20:40:46.045Z cpu8:10738)ScsiDeviceIO: 2316: Cmd(0x412403b18880) 0x1a, CmdSN 0x1027a from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
<6>tg3 : vmnic2: vmnic2: rx_mode 0x1700002(off)=>0x10001022013-08-26T20:50:46.051Z cpu10:8202)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124003b3c80, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T20:50:46.051Z cpu10:8202)ScsiDeviceIO: 2316: Cmd(0x4124003b3c80) 0x1a, CmdSN 0x1027b from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:00:46.056Z cpu11:8203)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x412402cce200, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T21:00:46.056Z cpu11:8203)ScsiDeviceIO: 2316: Cmd(0x412402cce200) 0x1a, CmdSN 0x1027c from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:02:51.557Z cpu13:8205)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x85 (0x4124431e3240, 9453) to dev "naa.690b11c006833a00183e6af116f473d2" on path "vmhba1:C2:T1:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T21:02:51.557Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x85, CmdSN 0x4896 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:02:51.557Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x4d, CmdSN 0x4897 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:02:51.557Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x1a, CmdSN 0x4898 from world 9453 to dev "naa.690b11c006833a00183e6af116f473d2" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
2013-08-26T21:02:51.580Z cpu13:8205)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x85 (0x4124431e3240, 9453) to dev "naa.690b11c006833a00183e5eb508bcdd7d" on path "vmhba1:C2:T0:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T21:02:51.580Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x85, CmdSN 0x4899 from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:02:51.580Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x4d, CmdSN 0x489a from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:02:51.580Z cpu13:8205)ScsiDeviceIO: 2316: Cmd(0x4124431e3240) 0x1a, CmdSN 0x489b from world 9453 to dev "naa.690b11c006833a00183e5eb508bcdd7d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0.
2013-08-26T21:10:46.059Z cpu4:8196)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124003faf80, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T21:10:46.059Z cpu4:8196)ScsiDeviceIO: 2316: Cmd(0x4124003faf80) 0x1a, CmdSN 0x10292 from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.
2013-08-26T21:20:46.068Z cpu11:8203)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x412402921fc0, 0) to dev "t10.DP______BACKPLANE000000" on path "vmhba1:C0:T32:L0" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0. Act:NONE
2013-08-26T21:20:46.068Z cpu11:8203)ScsiDeviceIO: 2316: Cmd(0x412402921fc0) 0x1a, CmdSN 0x102a0 from world 0 to dev "t10.DP______BACKPLANE000000" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x20 0x0.