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How does ONTAP maintain or release NFSv4 client locks?

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nas
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Applies to

  • ONTAP
  • NFSv4
  • Linux

Answer

  • The ONTAP  NFS vserver assigns a lease to every lock that is granted to the NFSV4 client
  • A lease time can be set for the ONTAP vserver for NFSv4

::*> nfs server show -vserver nsStorageD -fields v4-lease-seconds

vserver    v4-lease-seconds
---------- ----------------
vserver1   30
  • The server checks the client every 30 seconds before the lease expires in case the client responds back to the server to extend it further 
  • This checking is done on a per client basis and per lock on a single client by the server
  • The value is configurable from the NFS server storage side
  • ONTAP does not cause a lock, a lock is granted to a client
  • The duration of the locks is based on client renewing them
  • So if the client is active and maintaining the lock the filer will honor that lock

Additional Information

About NFSv4 file and record locking

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