Server ran out of file handles during manual NetApp failover

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Issue

During a planned NetApp maintenance with graceful failover from one Netapp controller to the other, the RHEL kernel suddenly and unexpectedly used up all 129,000 file handles.
LSOF of the server at the time showed only a few thousand file handles in use by all processes combined.

Environment

Red Hat Enterprise Linux, version 6
HP DL series system
Fibre connected NetApp filer
Vertica Database application

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