IBM iSeries 270 Service Manual page 21

v Yes: After you have determined the location of the disk unit to replace, remove the covers. See
Models 270, 800, and 810 - Covers. Then, continue with the next step.
v No: Go to Recovery procedures.
3. Remove the EMC access plate that is over the disk unit that you are removing. For location
information, see Locations - Model 270 or Locations - Models 800 and 810.
4. Concurrent repair is available on a Models 270, 800, and 810 if a storage expansion unit is installed. If
a storage expansion unit is not installed, concurrent maintenance may or may not be available. To
determine if concurrent repair is available on Models without a storage expansion unit, 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 —> Packaging hardware
resources.
c. On the display, select the Hardware contained within package option for the system unit.
d. Select the Associated logical resource(s) option for the Backplane that has a card position of
DB1.
v If the "No associated hardware resources were found" message appears at the bottom of the
display, concurrent maintenance is not available.
v If the Logical Resources Associated with a Packaging Resource display appears with at least
one Device Services entry, concurrent maintenance is available.
Are you removing or installing a disk unit using concurrent maintenance?
v Yes: Continue with the next step.
v No: Perform Models 270, 800, and 810 - Disk unit (dedicated).
5. 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 —> Device Concurrent
Maintenance and enter the required information in the information fields.
c. 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. 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. Removing a disk unit - concurrent
Analyze hardware problems
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