Check the bug info at Cisco site for CSCvz61883 / EMC article 000197332 and it applies to the MDS 9700 32G FC modules in our environment. The DS-X9648-1536K9 linecard in MDS 9700 can be affected at almost exactly 468 days of uptime.
Our MDS 9710 with 32G linecard are running 8.1(1a) with supervisor 3 and 8.4(1a) with supervisor 4. Runs the command below against the 32G linecard in MDS9710 to see module uptime. In our environment, they reach 426 and 417 days respectively.
slot x show system uptime
8.4(2d) does provide the fix to the issue but it is quite new. Open a ticket with support and the recommendation is to upgrade to 8.4(2c). This will reset the module uptime back to zero and buy another 400+ days. With 8.4(2), there is a workaround to reset the uptime for the device non-disruptively. You can consider another firmware update after 400 days on the FC switch.
Finished the upgrade to 8.4(2c) last week. Upgrade to 8.4(2c) on MDS 9710 with supervisor 3 is much faster than MDS 9710 with supervisor 4.
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Updated in late May 2023
Another reason we never considered 8.4(2d) was due to CSCwb29379 (see release notes 8.4(2e) below)
Cisco MDS 9000 Series Release Notes, Release 8.4(2e)
8.4(2e) was available for quite some time now. So, we upgraded to 8.4(2e) couple weeks ago to fix this problem permanently.
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