Attention: If removing the cover while powered on, errors may occur due to electromagnetic interference.
Attention: The disk unit is sensitive to electrostatic discharge (see Work with electrostatic
discharge-sensitive parts).
To remove or replace the disk unit using concurrent maintenance:
1. Determine if the system has logical partitions. Go to Determine if the system has logical partitions,
before continuing with this procedure.
2. Were you directed here from Recovery procedures?
v No: Go to “Recovery procedures” on page 539.
v Yes: After you have determined the location of the disk unit to replace, remove the front covers for
access. See FC 5074, FC 5079, FC 5094, FC 5294, FC 9079, FC 9094 - Covers. Then, continue
with the next step.
3.
Remove the EMC access plate that is over the location of the disk unit that you are removing.
4. To remove a disk unit using concurrent maintenance, perform the following:
a. Select System Service Tools (SST). If you cannot get to SST, select DST.
Do not perform a system IPL to get to DST.
b. Select Start a Service Tool —> Hardware Service Manager.
c. Select Device Concurrent Maintenance and enter the required information in the information
fields.
d. Press Enter on the console. After the delay time, the light above the device location will begin
flashing. You now have nine seconds to pinch the two surfaces of the latching mechanism together
and rotate the handle of the disk unit towards you. Pull the disk unit partially out of the tower. The
light above the device location will go off and remain off as soon as the device is no longer making
contact with the backplane.
Attention: If you remove the device when the light is not flashing, data may be lost, the disk unit
may be damaged, or the backplane may be damaged.
Analyze hardware problems 181
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