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

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.