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Writing large files to NFS mount causes high backlog wait stats, high avg exe or task blocked for more than 120 seconds messages

Solution Verified - Updated 2016-04-21T03:44:55+00:00 -

Issue

Slow system response times during database backups
Processes hanging while using I/O over NFS
Updating to 2.6.18-274.el5 (from 2.6.18-194.17.1.el5) causes very high CPU with NFS IO severely impacted
WRITE exe time is 10 seconds with high backlog wait.

Environment

Red Hat Enterprise Linux 5 (NFS client)
Red Hat Enterprise Linux 6 (NFS client)
Red Hat Enterprise Linux 7 (NFS client)
Typically these NFS clients have lots of RAM. e.g. Greater than 50 GiB of RAM.

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