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3. Select Service Mode or the Identify function. (For this example, assume that you
have selected Service Mode.) The list of pdisks is displayed again, and the disk
drive that you selected is marked by a >, which shows that the disk drive is in
Service Mode.
Notes:
a. You can select only one disk drive at time.
b. If you select Service Mode, and the selected disk drive is not in a closed loop or
at the end of a string (see Chapter 2, "Introducing SSA Loops" on page 7), your
selection fails and an error message is displayed. Use the Link Verification
service aid to identify any open-link problems before trying to reselect Service
Mode.
c. If you select Service Mode, and a file system is mounted on the selected disk
drive, your selection fails. Use the Configuration Verification service aid to
determine which hdisk must be have its file system unmounted before you can
select Service Mode.
d. If the Check light of the disk drive that you have put into Service Mode does not
come on, and you are not sure of the location of that disk drive, use the Identify
function to help you find it (see "The Identify Function" on page 375).
Chapter 17. SSA Service Aids
381
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