vx_ninode(5)							File Formats Manual						      vx_ninode(5)

NAME

       vx_ninode - determine the internal node table size

SYNOPSIS

       size]

VALUE

       You must set these tunables to a constant value.

   Minimum
       This tunable can be set to (which means default), or to a value equal or greater than

   Default
       Based on the available physical memory, by default (when is the internal inode cache size is set according to the following table.  In this
       table the first column is the amount of physical memory in megabytes installed on the system at boot time and the second column is the max-
       imum number of inodes to be cached.

	      Physical Memory (MB)   Maximum Inodes
	      8 		     400
	      16		     750
	      32		     1500
	      64		     2500
	      128		     5000
	      256		     16000
	      512		     32000
	      1024		     64000
	      2048		     128000
	      8192		     256000
	      32768		     512000
	      131072		     1024000

       VxFS interpolates the value of for the memory that falls between two points and extrapolates from the largest entry if the memory is larger
       than the largest entry in the table above.

   Recommended values
       Systems with low memory size (up to 3 GB per CPU) may not require a large inode cache when file system performance  is  not  critical.	HP
       recommends  setting  a  minimum value for based upon the memory configuration as specified in the following table.  In this table the first
       column represents the available physical memory in gigabytes and the second column is the value of

	      Physical Memory (GB)   vx_ninode
	      1 		     16384
	      2 		     32768
	      3 		     65536
	      >3		     131072

DESCRIPTION

       The VxFS file system caches the inodes in an inode table.  The kernel tunable determines the number of inodes in the inode  table  to  help
       VxFS in caching.  is a dynamic tunable.

   Who Is Expected to Change This Tunable?
       Any privileged user can change this value.  Note that the default state should be appropriate for most environments.

   Restrictions on Changing
       None.  The tunable is dynamic; tuning will take effect immediately on the running system.

   When Should the Value of This Tunable Be Raised?
       This  tunable  value should be raised when applications (for example, file servers and web servers) expect the file systems to perform bet-
       ter.

   What Are the Side Effects of Raising the Value?
       Increasing the value of this tunable may consume more memory.

   When Should the Value of This Tunable Be Lowered?
       HP recommends changing the value of this tunable according to the table above when the system is under memory pressure.

   What Are the Side Effects of Lowering the Value?
       The applications will see performance degradation.

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

EXAMPLES

       Change the value of to

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or its meaning may change in the  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 values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

SEE ALSO

       kctune(1M), vx_maxlink(5), vxfs_bc_bufhwm(5), vxfs_ifree_timelag(5).

							     Tunable Kernel Parameters						      vx_ninode(5)