It turns out to be a problem with the WWN manager process. Crashes of this process will result in writing error information to core files which stay loaded in memory. This memory is not getting released, which will in turn lead to high memory utilization.
Fix 1: Restart switch to free up core files from memory.
Fix 2: Register SR with Cisco. They will load a "Dplug" which removes the core files from memory without restarting the switch.
After this you have to upgrade to a new NX-OS version, to prevent the bug for claiming memory.
But TAC said nothing about a Dplug and we upgraded to NXOS 5.2.2d we still have a problem -
So is this a real issue --- if so any one any clues ?
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