3.Stop all I/O activity to the storage server and attached expansion units. Make sure that:
vAll of the green Drive active LEDs on the front of the storage server (and on all attached expansion units) are not flashing.
vThe green Cache active LEDs on the back of the storage server are off.
Attention: To turn off all power to the storage server, you must turn off both
4.Before the storage server is powered off, use the operating system software to either disconnect the storage server logical drives from the host or to flush the logical drive data cache in the host server memory.
5.If applicable, use the operating system software to disconnect the storage server logical drives from the host before the storage server is powered off.
6.Turn off the power to each device based on the following shutdown sequence:
a.Turn off power to the host before the storage server. If the host must stay powered on to support an existing network, see the operating system documentation for information about disconnecting the storage server logical drives from the host before the storage server is powered off.
b.Turn off power to the storage server before you turn off power to the expansion units. Turn off both power supply switches on the back of the storage server.
c.Turn off power to other supporting devices (for example, management stations,
Note: You do not need to perform this step if you are servicing only the storage server.
7.After you perform the necessary maintenance procedures, turn on the power using the procedure in “Turning on the storage server” on page 66.
Restoring power after an unexpected shutdown
The storage server might shut down unexpectedly under any of the following conditions:
Attention: There might be data loss in each of the following cases:
vThe internal temperature of the storage server exceeds the maximum operating temperature (an
If both fan CRUs fail or are unable to maintain an internal temperature below 70° C (158° F), one or both of the power supplies in the storage server will shut down. If both power supplies shut down, the unit is inoperable.
The DS4000 Storage Manager client warns you if the temperature of the unit is rising before it has risen sufficiently to shut down the power supplies. The first warning comes when the storage server internal temperature exceeds 45° C (113° F). The storage server shuts down if the temperature rises to 70° C (158° F).
vThere is a general power failure or a loss of power to the unit.
vYou are forced to shut down the storage server without performing the normal shutdown procedures (listed in “Turning off the storage server” on page 67) because of an emergency situation.
68IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide
