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remote_nfs_swap(5)					    remote_nfs_swap(5)

NAME
       remote_nfs_swap - enable swapping across NFS

VALUES
   Default
   Allowed values
DESCRIPTION
       This  tunable  controls adding a NFS filesystem for use as swap.	 If is
       set to only local filesystems and devices can be used for swap.	If  it
       is set to both local and networked file systems can be used for swap.

       Historically,  this tunable was used in NFS clusters that are no longer
       supported, but this capability has not yet been removed.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect on the next boot.

   When Should the Tunable Be Turned On?
       Almost never.  As previously mentioned, this tunable was	 designed  for
       systems which are not in use today.  Only systems with extremely robust
       NFS capabilities should even consider using NFS for swap.

   What Are the Side Effects of Turning the Tunable On?
       If the value is set to and a NFS partition is added as swap, then  some
       kernel  memory  will be set aside for NFS transactions to the swap file
       system.	The kernel will then use the NFS swap partition just the  same
       as  a local file system.	 If the NFS capabilities of the system are not
       robust, this could lead to extremely long swap times (both swap in  and
       swap  out), and possibly a loss of memory because all the reserved mem‐
       ory and more could be used by NFS (just when memory pressure  is	 high)
       causing the need for swap.

   When Should the Tunable Be Turned Off?
       Unless  you  are	 positive  that	 the NFS system can handle the load of
       being used as swap, and does not have a local file system or disk drive
       to spare, this tunable should be set to

   What Are the Side Effects of Turning the Tunable Off?
       Any  previously defined NFS swap filesystems will no longer be allowed.
       Kernel memory will not be reserved for NFS transactions due to swap.

   What Other Tunables Should Be Changed at the Same Time?
       None.

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 HP.

			   Tunable Kernel Parameters	    remote_nfs_swap(5)

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