User guide

Power On/Off procedures 5–5
Hitachi Unified Storage VM Block Module Hardware User Guide
Power off procedures
Prerequisites:
• Ensure that all software-specific shutdown procedures have been
completed. Refer to the applicable user manuals for details
• Ensure that the SVP mode is set to “View Only”.
• Ensure that all I/O activity to the storage system has stopped. You can
vary paths offline and shut down the attached hosts.
• Ensure that all users have logged off.
Follow this procedure exactly when powering the storage system off.
1. Wait for the storage system to complete its shutdown routines.
Depending on the storage system configuration and certain MODE
settings, it can take up to 20 minutes for the storage system to copy
data from cache to the disk drives and for the disk drives to spin down.
2. If the front bezel is installed, press the POWER OFF button. If the front
bezel is not installed, move the POWER ON/OFF switch to the OFF
position.
Emergency power off/on procedure
This section describes the procedures to follow to shut down the system in
case of emergency and how to bring the system back up after an emergency
shutdown.
Emergency power off procedure
The HUS VM storage system does not have an emergency power off switch
as the USP V/VM storage system does.
To shut the system down in an emergency, power off the controller first,
then the drive units, as follows.
1. Open the back door of the rack that contains the control unit.
a. Turn off the circuit breakers in both lower PDUs in the rack.
b. Turn off the circuit breakers in both upper PDUs in the racks with the
control unit.
2. Open the back doors of all racks that contain only drive units and turn
the circuit breakers off in all the PDUs in any order in those racks.
Note: If the READY LED does not turn OFF after 20 minutes, contact
the support center for assistance.
Note: Quick Procedure
Controller: Power PDUs off first. Power PDUs on last.
Drives: Power PDUs off last. Power PDUs on first.