Whatever you configure on MDS, whatever you configure on Cisco UCS FIs, whatever you do for port channel on both side, the Cisco UCS uplink ports always down with error message Initilize failed, or Error disabled.
Congratulation! your device hit MDS firmware bug…https://tools.cisco.com/bugsearch/bug/CSCtr01652/?reffering_site=dumpcr.
Your vHBAs or other PCI devices may stop running in ESXi 5.x when using Interrupt Remapping feature.
This issue only impact to UCS blade BIOS version 1.4(3c), it has been fixed on 1.4(3j).
Please refer to http://kb.vmware.com/kb/1030265 to see how to disable Interrupt Remapping feature in ESXi 5.x
Also refer to https://tools.cisco.com/bugsearch/bug/CSCty96722.