IBM DCS3860, Installation, User'S, And Maintenance Manual

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Attention:: Turning off and turning on power without waiting for the storage
system disk drives to spin down can damage the drives and might cause data loss.
Always wait at least 90 seconds after you turn off the power before you turn on
the power again.
Power-off overview
Turn off the power to each device according to the following shutdown sequence:
1. Turn off power to the host before the storage system. If the host must stay
powered-on to support a network, see the operating-system documentation for
information about disconnecting the storage system logical drives from the host
before the storage system is powered-off.
2.
Turn off power to the storage system before you turn off power to the
expansion enclosures. Turn off both power-supply switches on the rear of the
enclosures.
3. Turn off power to other supporting devices (for example, management
stations).
Note: You do not have to perform this step if you are servicing only the
storage system.
To turn off power to one or more components of the storage system for a planned
shutdown, complete the steps in the following procedure. To turn off power for an
unplanned shutdown, see“Restoring power after an unexpected shutdown” on
page 73.
Figure 8 on page 14 shows the locations of the power switches on a storage system.
Before you proceed, use the Storage Manager software to determine the status of
the storage system components and special instructions. You might have to
complete other procedures before you turn off the power.
Chapter 4. Operating the DCS3860 storage system and EXP3800 expansion enclosure
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