IBM TotalStorage DS4000 EXP100 Installation, User's, And Maintenance Manual page 85

ATTENTION:
Before you power on the DS4000 storage subsystem, the EXP100 must be
populated with at least two drives. If at least two drives are not installed in
each attached storage expansion enclosure when you power on the DS4000,
your standard storage partition key will be lost and will need to be regenerated
using instructions on the IBM DS4000 Solutions and Premium Features Web
site:
www-912.ibm.com/PremiumFeatures/
All of the drives in each connected EXP100 unit must contain no prior
configuration data. Additionally, if at least two drives are not installed in each
attached EXP100, the resulting insufficient load to the EXP100 power supply
CRUs might cause the EXP100 power supply CRUs to intermittently appear
as failed and then reappear in an optimal state, falsely indicating that the
power supply CRUs are bad.
If this is the first time that you power on the DS4000 after you received it from
the factory, ensure that the EXP100 storage expansion enclosure with at least
two drives is connected to the DS4000 and is powered on before you power
on the DS4000. Failure to do this will prevent the DS4000 from booting up
with the factory installed premium features enabled correctly.
In addition, consider the following items:
v The storage subsystem supports simultaneous power-up of the system
components; however, you should always follow the power-up sequence
listed in the "Turning on the storage subsystem section" of the appropriate
DS4000 User's Guide during any attended power-up procedure.
v A storage system in an optimal state should recover automatically from an
unexpected shutdown and unattended simultaneous restoration of power to
system components. After power is restored, contact IBM technical support
if any of the following conditions occur:
– The storage subsystem logical drives and arrays do not display in the
Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and arrays do not come online.
– The storage subsystem logical drives and arrays seem to be degraded.
Use the following startup sequence to turn on the power for the initial startup of the
EXP100:
1. Verify that the following conditions exist:
v All communication and power cables are plugged into the back of the
expansion enclosure and that all power cables are connected to an ac power
outlet.
v All SATA drive CRUs are locked securely in place in the drive slots of the
EXP100 expansion enclosure chassis.
v The enclosure IDs on the EXP100 expansion enclosures are set correctly.
(See "Setting the interface options" on page 44 for more information.)
2. Check the system documentation for all the hardware devices that you intend to
turn on and determine the proper startup sequence. Use the following power-on
sequence, where applicable:
Chapter 2. Installing the EXP100
59