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This post has been moved from the Storage forum,
to the Generic Linux forum, for closer topic alignment.
You had it in a HARDWARE forum but have no apparent issues with Sun/Oracle branded storage hardware. Your question may even be outside the scope of this entire OTN forum web site as it appears to be specific to your OS or your external storage peripheral. Perhaps you might consider finding a CentOS or a NetApp forum instead.
Your Firewalls may block communication between the client’s lock manager and the server. Apparently you can fix the lock recovery problem using NetApp's sm_mon -l or lock break commands. I suggest to search the Internet for "netapp network lock manager" or find Netapp forum.