OpenVMS Cluster Systems - OpenVMS Systems - HP

Cluster System Parameters
A.1 Values for Alpha and VAX Computers
Table A–1 (Cont.) Adjustable Cluster System Parameters
Parameter Description
‡MC_SERVICES_P7
(dynamic)
Specifies whether to suppress or display messages about cluster activities on
this node. Can be set to a value of 0, 1, or 2. The meanings of these values
are:
Value Meaning
0 Nonverbose mode—no informational messages will appear on the
console or in the error log.
1 Verbose mode—informational messages from both MCDRIVER
and PMDRIVER will appear on the console and in the error log.
2 Same as verbose mode plus PMDRIVER stalling and recovery
messages.
The default value is 0. Compaq recommends that this value not be changed
except for debugging MEMORY CHANNEL problems or adjusting the MC_
SERVICES_P9 parameter.
‡MC_SERVICES_P9 (static) Specifies the number of initial entries in a single channel’s free queue. The
maximum value is 2048 and the minimum value is 10.
Note that MC_SERVICES_P9 is not a dynamic parameter; you must reboot
the system after each change in order for the change to take effect.
The default value is 150. Compaq recommends that this value not be
changed.
This parameter value must be the same on all nodes connected by MEMORY
CHANNEL.
‡MPDEV_AFB_INTVL
(disks only)
Specifies the automatic failback interval in seconds. The automatic failback
interval is the minimum number of seconds that must elapse before the
system will attempt another failback from an MSCP path to a direct path on
the same device.
MPDEV_POLLER must be set to ON to enable automatic failback. You can
disable automatic failback without disabling the poller by setting MPDEV_
AFB_INTVL to 0. The default is 300 seconds.
‡MPDEV_D1 (disks only) Reserved for use by the operating system.
‡MPDEV_D2 (disks only) Reserved for use by the operating system.
‡MPDEV_D3 (disks only) Reserved for use by the operating system.
‡MPDEV_D4 (disks only) Reserved for use by the operating system.
‡MPDEV_ENABLE Enables the formation of multipath sets when set to ON ( 1 ). When set to
OFF ( 0 ), the formation of additional multipath sets and the addition of new
paths to existing multipath sets is disabled. However, existing multipath
sets remain in effect. The default is ON.
MPDEV_REMOTE and MPDEV_AFB_INTVL have no effect when MPDEV
ENABLE is set to OFF.
‡MPDEV_LCRETRIES Controls the number of times the system retries the direct paths to the
(disks only)
controller that the logical unit is online to, before moving on to direct paths
to the other controller, or to an MSCP served path to the device. The valid
range for retries is 1 through 256. The default is 1.
‡Alpha specific
A–4 Cluster System Parameters
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