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fcd_disable_mgmt_lun(5)				       fcd_disable_mgmt_lun(5)

NAME
       fcd_disable_mgmt_lun  -	select whether or not management luns are dis‐
       covered in the legacy representation of mass storage devices

VALUES
   Failsafe
   Default
   Allowed values
       Enable discovery of management luns for array devices.

       Disable discovery of management luns for array devices.

   Recommended values
DESCRIPTION
       Management luns provide the means to access the control ports of	 Fibre
       Channel	disk  arrays.  They are represented in both the legacy and the
       agile view of storage devices.  The legacy representation of a  manage‐
       ment  lun  is  typically created under a separate virtual extension bus
       node.  The entry for a legacy management lun looks like this:

       On a system with a large number of storage devices connected,  creation
       of  management  luns  can  result  in an insufficient number of virtual
       extension buses for the legacy representation of data luns.  Since  the
       number of extension buses on a system is limited to 256, luns requiring
       virtual extension buses above  256  will	 be  unusable  through	legacy
       device  special files.  Disabling the discovery and creation of manage‐
       ment luns will free up virtual extension buses for use by data luns.

       The default value for this tunable is

   Who Is Expected to Change This Tunable?
       System administrators who expect to  use	 a  large  number  of  storage
       devices	requiring  more than 256 extension buses through legacy device
       special files.

   Restrictions on Changing
       Changes to this tunable take  effect  immediately.   However,  existing
       management luns will not be removed.

   When Should the Tunable Be Turned On?
       This  tunable should be turned on when the system runs out of extension
       buses for configuring the legacy representation of data luns.

   What Are the Side Effects of Turning the Tunable Off?
       None.

   When Should the Tunable Be Turned Off?
       When the functionality provided by the management lun is desired.

   What Are the Side Effects of Turning the Tunable On?
       Existing management luns in the legacy representation will show	up  in
       the state.

   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 Hewlett-Packard Company.

SEE ALSO
       ioinit(1M), ioscan(1M), kctune(1M).

			   Tunable Kernel Parameters   fcd_disable_mgmt_lun(5)

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