st_ats_enable man page on HP-UX

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st_ats_enable(5)					      st_ats_enable(5)

NAME
       st_ats_enable - determine whether to reserve a tape device on open

VALUES
   Default
   Allowed values
   Recommended values
DESCRIPTION
       Note: this tunable was named in releases prior to HP-UX 11i v3.

       This  tunable  notifies	the stape or estape driver whether it needs to
       reserve a tape device on open and subsequently  release	it  on	close.
       When  this  tunable  is	on, the stape or estape driver will attempt to
       reserve any tape device on open.	 The driver has	 a  few	 tape  devices
       flagged as suitable devices for this functionality including: DLT 8000,
       DLT 7000, STK 9840, HP Ultrium, and others.  DDS drives are not flagged
       for this functionality.

       The  tunable  allows the safe sharing of tape devices in multinode con‐
       figurations like MC/ServiceGuard's Advanced Tape	 Sharing.   The	 auto‐
       matic  reserve and release protects the tape device from being accessed
       from multiple nodes, which would corrupt a backup.  If the reserve por‐
       tion of the stape or estape driver's open routine fails, a status of is
       returned.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect immediately and are used during the
       next open or close.

   When Should the Tunable Be Turned On?
       This  tunable  should be turned on if the system is going to be used in
       an MC/ServiceGuard's Advanced Tape Sharing configuration	 or  the  user
       wants  the  stape or estape driver to use automatic reserve and release
       on open and close for multinode manageability.

   What Are the Side Effects of Turning the Tunable On?
       A reserve is sent to the tape device by the stape or estape  driver  on
       open and a release is sent on close.  No other initiator or HBA will be
       able to access the tape device while it is opened on another  initiator
       or HBA.

   When Should the Tunable Be Turned Off?
       This  tunable  should  be  turned off for any SAN tape sharing solution
       configuration other than ATS.  Most multinode backup applications  (for
       example, Omniback) manage device reservation themselves, and any inter‐
       ference by the stape or estape driver may produce problems.  This  tun‐
       able  should also be turned off for any multiplatform SAN configuration
       to keep tape access across platforms more uniform.

   What Are the Side Effects of Turning the Tunable Off?
       Unauthorized access from another initiator  might  interfere  with  any
       current tape operation.

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

EXAMPLES
       Query the current value of the tunable:

       Set the value of the tunable to

       To save the value of the tunable across reboots:

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.

SEE ALSO
       scsi_tape(7), scsimgr_estape(7).

			   Tunable Kernel Parameters	      st_ats_enable(5)
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