I suggest to refer to EMC's "Technical Advisory ETA emc300455 / Cisco Bug CSCua02159 - "Devices zoned by device alias lose connectivity after port flap or zone activate", first.  My personal suggestion is to upgrade to NX-OS 5.2(6a) or higher.   I know some production environments running NX-OS 5.2(6) / 5.2(6a) since Aug-12 without problems.  Today, I suggest to RPQ NX-OS 5.2(8) for a new deployment, having the need to connect to McDATA "Open Fabric Mode 1.0" switches to avoid from running into bug CSCuc35483.  I hope this will help...   Kind regards, Swen
Hi experts,  I'm running NX-OS 5.0(4) on a number of switches and I'm trying to figure out to what version I should be looking to upgrade. EMC now supports 5.2(6a), but Cisco is already at 5.2(8). What are your experiences with the latest versions? The 504 I'm running now has a bug that core dumps are being made to RAM and when RAM is completely filled up, the switch reboots, so I desperately need to upgrade to something new and stable.
Need to upgrade to newer NX-OS, but which one?