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 tunefstab(4)							tunefstab(4)

      tunefstab (vxfs) - VxFS tuning parameters table

      The tunefstab file contains tuning parameters for VxFS file systems.
      tunefs sets the tuning parameters for mounted file systems by
      processing command line options or by reading parameters in the
      tunefstab file.

      Each entry in tunefstab is a line of fields in one of the following

	   block-device	  tunefs-options
	   system-default tunefs-options

      block-device is the name of the device on which the file system is
      mounted.	If there is more than one line that specifies options for a
      device, each line is processed and the options are set in order.

      In place of block-device, system-default specifies tuneables for each
      device to process.  If there is an entry for both a block-device and
      system-default, the system-default value takes precedence.

      Lines in tunefstab that start with the pound (#) character are treated
      as comments and ignored.

      The tunefs-options correspond to the tuneable parameters that vxtunefs
      and mount_vxfs set on the file system.  Each option in this list is a
      name=value pair. Separate the options by commas, with no spaces or
      tabs between the options and commas.

      See the vxtunefs(1M) manual page for a description of the supported

      If you have a four column striped volume, /dev/vg01/lvol3, with a
      stripe unit size of 128 kilobytes per disk, set the read_pref_io and
      read_nstream parameters 128 and four, respectively.  You can do this
      in two ways:

	   /dev/vg01/lvol3     read_pref_io=128k,read_nstream=4


	   /dev/vg01/lvol3     read_pref_io=128k
	   /dev/vg01/lvol3     read_nstream=4

      To set the discovered direct I/O size lower so that it is always lower
      than the default, add the following line to the /etc/vx/tunefstab

 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000

 tunefstab(4)							tunefstab(4)

	   /dev/dsk/c3t1d0 discovered_direct_iosz=128K

      /etc/vx/tunefstab		    Default tunefstab file.

      mkfs_vxfs(1M), mount(1M), vxtunefs(1M).

 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000