RHV reports storage latency such as "Storage domain X experienced a high latency of X seconds from host X. This may cause performance and functional issues", what should I do?

Solution Verified - Updated -

Issue

RHEV reports this warning message for some of its storage domains:

Storage domain X experienced a high latency of X seconds from host X. 
This may cause performance and functional issues. Please consult your storage administrator.

What does it mean and what action is required?

Environment

  • Red Hat Virtualization (RHV) 4.x

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