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hfs_revra_per_disk(5)					 hfs_revra_per_disk(5)

NAME
       hfs_revra_per_disk  -  maximum HFS file system blocks to be read in one
       read-ahead operation when sequentially reading backwards

VALUES
   Failsafe
   Default
   Allowed values
DESCRIPTION
       This tunable defines the maximum number of file	system	blocks	to  be
       read in one read-ahead operation when sequentially reading backwards.

   Who Is Expected to Change This Tunable?
       HP Field engineers, but not customers directly.

   When Should the Value of This Tunable Be Raised?
       The  value of this tunable should be increased if there is a large num‐
       ber of reverse sequential file I/O on file systems with small file sys‐
       tem block size.

   What Are the Side Effects of Raising the Value?
       The system will consume more memory in the buffer cache.

   When Should the Value of This Tunable Be Lowered?
       The  value  of  this  tunable should be lowered when there is a smaller
       number of reverse sequential file I/O on files systems with large  file
       system block size.

   What Are the Side Effects of Lowering the Value?
       The file throughput rate will be decreased.

   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	 hfs_revra_per_disk(5)

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