OpenVMS Cluster Systems - OpenVMS Systems - HP

Table 9–8 (Cont.) Controlling Satellite Booting
Method Comments
Boot satellites remotely with Trigger
The console firmware in some satellites, such as the VAX 3100
and VAX 4000, allow you to boot them remotely using the DECnet
Trigger operation. You must turn on this capability at the console
prompt before you enter the NCP command TRIGGER, as shown:
1 To boot VAX satellites using the DECnet Trigger facility,
enter these commands at the console prompt:
>>> SET MOP 1
>>> SET TRIGGER 1
>>> SET PSWD
2 Trigger a satellite boot remotely by entering the following
commands at the NCP prompt, as follows:
$ MCR NCP
NCP> TRIGGER NODE satellite -
_ VIA MNA-1 SERVICE PASSWORD password
Building Large OpenVMS Cluster Systems
9.4 Configuring and Booting Satellite Nodes
Optionally, you can set up the MOP server to run a
command procedure and trigger 5 or 10 satellites at
a time to stagger the boot-time work load. You can
boot satellites in a priority order, for example, first
boot your satellite, then high-priority satellites, and
so on.
1. The SET TRIGGER 1 command enables the
DECnet MOP listener, and the SET PSWD
command enables remote triggering. The SET
PSWD command prompts you twice for a 16digit
hexadecimal password string that is used
to validate a remote trigger request.
Note: You need to enter the SET commands
only once on each system, because the settings
are saved in nonvolatile RAM.
2. MNA-1 represents the MOP service circuit,
and password is the hexadecimal number that
you specified in step 1 with the SET PSWD
command.
Important: When the SET HALT command is set up as described in Table 9–8,
a power failure will cause the satellite to stop at the console prompt instead of
automatically rebooting when power is restored. This is appropriate for a mass
power failure, but if someone trips over the power cord for a single satellite it can
result in unnecessary unavailability.
You can provide a way to scan and trigger a reboot of satellites that go down this
way by simply running a batch job periodically that performs the following tasks:
1. Uses the DCL lexical function F$GETSYI to check each node that should be
in the cluster.
2. Checks the CLUSTER_MEMBER lexical item.
3. Issues an NCP TRIGGER command for any satellite that is not currently a
member of the cluster.
9.5 System-Disk Throughput
Achieving enough system-disk throughput requires some combination of the
following techniques:
Technique Reference
Avoid disk rebuilds at boot time. Section 9.5.1
Offload work from the system disk. Section 9.5.2
Configure multiple system disks. Section 9.5.3
Use Volume Shadowing for OpenVMS. Section 6.6
Building Large OpenVMS Cluster Systems 9–13