User`s guide

2. Quiesce the SBB’s port by pressing and holding the controller port button for
the SBB. Continue holding the button until all controller amber OCP LEDs
light.
Note
Only one port can be quiesced at any time.
If the button is not held long enough, or multiple buttons are pushed in
quick succession, all buttons are ignored (no ports are quiesced). The
button must be pressed and held again to quiesce the port.
3. Wait until the chosen controller port LED flashes alternately with the other
port LEDs (this indicates I/O has stopped). The alternating pattern flashes
for approximately 30 seconds, during which time the SBB can be removed.
If the pattern does not appear after a minute or two, another shelf is
asserting a fault signal that prevents any quiesce function on this controller.
To correct the problem, the suspect shelf must be located and all devices must
be removed.
4. To remove the SBB, press its two mounting tabs together to release it from
the shelf, and pull it out using both hands (see Figure 5–2). While the
controller OCP LEDs are flashing, any remaining SBBs on the quiesced port
will flash their status LEDs.
Figure 5–2 Removing a Storage Device SBB (Cabinet Removed for Clarity)
CXO-4312A-MC
Note
The length of time required for I/O to stop can vary from zero seconds to
several minutes, depending on load, device type, and cache status.
5–4 Removal and Installation Procedures