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Powering a Server Off and On
See Change History for a history of changes made to this topic.
Most servers are running 24 hours a day. When it is necessary to power off a server,
for example, before disconnecting AC power, you must power it off first using OSM,
TSM, or SCF. If the enclosures are not placed in a power-down state first, they enter
power-fail mode and continue drawing battery power when main power is removed.
The exception is when the emergency power-off (EPO) switch is activated. If this
option is installed, the EPO switch shuts down the system and removes battery power.
Do not power off a server or an enclosure until you have identified affected
applications, processes, and devices and taken the appropriate actions. To power off
individual enclosures on running systems, see the NonStop S-Series System
Expansion and Reduction Guide. Do not power off a system until you have brought the
applications and processes to an orderly stop. On most systems, the customer
maintains startup and shutdown files for this purpose. If the system is not shut down
properly, an unrecoverable loss of data can occur.
To restore power, see Powering On a Server.
There are two options for removing power:
Halt all processors by using the OSM Service Connection or TSM Service
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Application, and then power off the server by using the Low-Level Link.
Halt all processors except one by using the OSM Service Connection or TSM
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Service Application, and then power off the server by using SCF. SCF can be
used only on running servers.
Before halting the applications and powering off a server:
Notify users in advance so they can be prepared.
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Plan your activity or new configuration in advance.
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Caution: If the system is part of a ServerNet cluster, remove the system from the
cluster before stopping the system. See the ServerNet Cluster Manual for details.
Preparing to Shut Down the Applications and System Software:
1 Schedule the shutdown in advance, if possible. Send a message to notify the
users.
2 lf shutdown command files are being used, execute the files or ask the customer
to execute them.
If Shutdown Command Files Are Not Used:
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