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nfs3_bsize(5)							 nfs3_bsize(5)

NAME
       nfs3_bsize  -  controls	the  logical  block size used by NFS version 3
       clients

VALUES
   Failsafe
   Default
   Allowed values
   Recommended Values
       A warning will be issued at runtime if this tunable is set to  a	 value
       greater than 1048576 bytes since this is beyond the tested limit.  This
       is not a serious warning but just an information message for the admin‐
       istrator.

DESCRIPTION
       controls	 the  logical  block  size used by NFS version 3 clients. This
       block size represents the amount of data the client  attempts  to  read
       from or write to the server when it does I/O.

   Who Is Expected to Change This Tunable?
       The distributed file system administrator should examine this value and
       change it if a larger transfer size is needed.

   Restrictions on Changing
       The tunable is dynamic; however, the logical block size setting	for  a
       file system is set when the file system is mounted.  In order to affect
       a particular file system, it is necessary to unmount and mount the file
       system after changing this parameter.

   When Should the Value of This Tunable Be Raised?
       Increase this parameter and also the parameters if larger transfers are
       desired.

   What Are the Side Effects of Raising the Value?
       More kernel memory is used to manage the transfer buffer.

   When Should the Value of This Tunable Be Lowered?
       Lower the value of this tunable if smaller transfer sizes are desired.

   What Are the Side Effects of Lowering the Value?
       Setting this value to less than 32  KB  will  increase  the  number  of
       requests to the NFS server.

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_max_transfer_size(5),
       nfs3_max_transfer_size_cots(5), nfs4_bsize(5), values(5).

			   Tunable Kernel Parameters		 nfs3_bsize(5)

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