Note: Determine if the system has logical partitions. Go to Determine if the system has logical partitions
before continuing with this procedure.
Attention: The disk unit is sensitive to electrostatic discharge (see Work with electrostatic
discharge-sensitive parts).
1. Were you directed here from Recovery procedures?
v Yes: Continue with the next step.
v No: Go to Recovery procedures. Then, return here.
2.
After you have determined the location of the disk unit to replace, remove the covers for access. See
Models 830/SB2 with FC 9074 - Covers or Models 840/SB3 - Covers for the model that you are
working on.
3. Remove the EMC access plate that is over the location of the disk unit that you are removing. (For
location information, see Locations — Models 830, SB2 system unit with FC 9074 base I/O tower or
“Locations — Models 840, SB3 system unit with processor tower and FC 9079 Base I/O Tower” on
page 270 for the model that you are working on.) The associated tables will direct you to the remove
and replace procedures.
4. Are you removing or replacing a disk unit using concurrent maintenance?
v No: Perform Dedicated maintenance - Remove and replace (See page ) below.
v Yes: Perform Concurrent maintenance - Remove and replace (See page ) below.
Concurrent maintenance - Remove and replace
Attention: If removing the cover while powered on, errors may occur due to electromagnetic interference.
1. 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 out part way. 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.
Figure 1. Disk unit removal, Models 830/SB2 and 840/SB3 (concurrent)
Analyze hardware problems 83
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