fcd_disable_mgmt_lun(5)fcd_disable_mgmt_lun(5)NAMEfcd_disable_mgmt_lun - select whether or not management luns are dis‐
covered in the legacy representation of mass storage devices
Enable discovery of management luns for array devices.
Disable discovery of management luns for array devices.
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
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?
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
What Other Tunables Should Be Changed at the Same Time?
All HP-UX kernel tunable parameters are release specific. This parame‐
ter may be removed or have its meaning changed in future releases of
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
was developed by Hewlett-Packard Company.
SEE ALSOioinit(1M), ioscan(1M), kctune(1M).
Tunable Kernel Parameters fcd_disable_mgmt_lun(5)