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vxfs_bc_bufhwm(5)					     vxfs_bc_bufhwm(5)

NAME
       vxfs_bc_bufhwm  - VxFS buffer cache high water mark(determines the VxFS
       buffer cache size)

SYNOPSIS
VALUE
       Specify an integer value.

   Minimum
       6144 KB

   Maximum
       90% of kernel memory.

   Default
       0

DESCRIPTION
       VxFS maintains a buffer cache in the  kernel  for  frequently  accessed
       file  system metadata in addition to the HP-UX kernel buffer cache that
       caches the file data.  tunable parameter determines  the	 size  of  the
       VxFS  buffer  cache  (the  maximum amount of memory that can be used to
       cache VxFS metadata).

       The default value computed based on the amount of system memory ensures
       good system performance across a wide range of applications.

       The  value  of is specified in kilobytes. To improve performance during
       application loads that cause frequent file system metadata  changes  on
       the  system  (for example, a high rate of file creation or deletion, or
       accessing large directories), change the value of

   Notes
       Use the command to monitor buffer  cache	 statistics  and  inode	 cache
       usage.

EXAMPLES
       Set the maximum of size of buffer cache at 300000:

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter 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 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

SEE ALSO
       kctune(1M), vxfsstat(1M), vx_maxlink(5), vx_ninode(5), vxfs_ifree_time‐
       lag(5).

			   Tunable Kernel Parameters	     vxfs_bc_bufhwm(5)

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