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Set Service Mode Service Aid
The Set Service Mode service aid enables you to determine the location of a particular
disk drive, and to remove that disk drive from the unit in which it is installed. It causes
the Check light of that disk drive to come on for identification, and stops all SSA loop
activity through the disk drive. It also causes the Subsystem Check light (if present) of
the unit containing the selected disk drive to come on. Only one disk drive at a time can
be in Service Mode.
Before using this service aid, you must make the selected disk drive unavailable to the
using system; otherwise, an error occurs.
SSA devices can be maintained concurrently; that is, they can be removed, installed,
and tested on an SSA loop while the other devices on the loop continue to work
normally. If a disk drive has its Check light on, the pdisk might not be configured. If the
pdisk is not configured, you cannot select Service Mode. Under these conditions, you
can remove the disk drive from the SSA loop without taking any special actions.
If a disk drive does not have its Check light on, the SSA loop that passes through it
might still be active, although the disk drive itself might not be working. You must put
that disk drive into Service Mode before you remove it from the SSA loop.
If you leave the Set Service Mode service aid, Service Mode is reset.
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User's Guide and Maintenance Information
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