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RHEL 6.5 NFS client does not cache just written files on an NFS share mounted from a NetApp filer

Solution Unverified - Updated 2016-05-13T15:26:04+00:00 -

Issue

When we have just written files, from a RHEL6u5 client via NFS to our NetApp filer, and we read them back via the same client, we notice that this takes a very long time.
When we read the files back for a second time this is very quick.
The problem we suffer is that our NetApp filers are currently hammered by a huge read load and we think this is caused by our introduction of RHEL 6u5.

Environment

Red Hat Enterprise Linux (RHEL) 6.5 and 6.6
kernel 2.6.32-431.el6 or higher
kernel 2.6.32-504.el6 or higher
NetApp filer as the NFS server
- 7-mode NetApp filer

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