hfs_revra_per_disk(5)						File Formats Manual					     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 number of reverse sequential file I/O on file systems with small file
       system 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 parameter 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 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

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters					     hfs_revra_per_disk(5)