nfs2_nra man page on HP-UX

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nfs2_nra(5)							   nfs2_nra(5)

NAME
       nfs2_nra	 -  control  the number of read-ahead operations queued by the
       NFS version 2 client when sequentially accessing a file

VALUES
   Failsafe
   Default
   Allowed values
   Recommended values
       A warning will be issued at runtime if the tunable is set  to  a	 value
       greater than 16 since this is beyond the tested limit.

       This  is	 not a serious warning but just an information message for the
       administrator.

DESCRIPTION
       controls the number of read-ahead operations that are queued by the NFS
       version 2 client when sequential access to a file is discovered.	 These
       read-ahead operations increase concurrency and read  throughput.	  Each
       read-ahead request is generally for 8192 bytes of file data.

   Who Is Expected to Change This Tunable?
       The  distributed	 file  system  administrator should examine this value
       depending on network bandwidth and memory pressure on the client.

   Restrictions on Changing
       The tunable is dynamic; tuning will take effect immediately on the run‐
       ning system.

   When Should the Value of This Tunable Be Raised?
       If  the	network	 is very high bandwidth and the client and server have
       sufficient resources, increase this value to more  effectively  utilize
       the  available  network bandwidth, the client resources, and the server
       resources.

   What Are the Side Effects of Raising the Value?
       Tuning incorrectly based on network  bandwidth  can  cause  performance
       problems.

   When Should the Value of This Tunable Be Lowered?
       In  a very low bandwidth network, you might want to decrease this value
       so the NFS client does not overload the network.

   What Are the Side Effects of Lowering the Value?
       Tuning incorrectly based on network  bandwidth  can  cause  performance
       problems.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter may be removed or have its meaning changed in  future  releases  of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may
       cause changes to tunable parameter values.   After  installation,  some
       tunable	parameters may no longer be at the default or recommended val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by Sun Microsystems, Inc.

SEE ALSO
       kctune(1M),  sam(1M), gettune(2), settune(2), nfs3_nra(5), nfs4_nra(5),
       values(5).

			   Tunable Kernel Parameters		   nfs2_nra(5)
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