Processor Memory; Overview Of Ds8000 Power Controls - IBM DS8000 User Manual

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Processor memory

Overview of DS8000 power controls

servers/storage/disk/ds8000/ or the System Storage Interoperation Center (SSIC)
at http://www.ibm.com/systems/support/storage/config/ssic/.
The DS8100 Models 921 and 931 offer up to 128 GB of processor memory. The
DS8300 Models 922, 932, 9A2, and 9B2 offer up to 256 GB of processor memory.
The nonvolatile storage (NVS) scales to the selected processor memory size, which
can also help optimize performance.
The DS8000 series provides power controls on the model racks. Power controls can
be configured by an IBM service support representative. Power controls can also be
accessed through the Management Console.
The DS8000 models have these following manual power controls in the form of
physical switches on the racks:
v Local/remote switch
(Available on base models) The local/remote switch setting determines whether
you will use local or remote power controls. When you set the switch to local,
the local power on/local force power off switch controls power in the storage
unit. You can access this switch by opening the rear cover of the unit. When the
local/remote switch is set to remote, the power for the storage unit is controlled
by remote power control settings that are entered in the DS Storage Manager.
Planning requirements: None.
v Local power on/local force power off switch
(Available on base models) The local power on/local force power off switch
initiates a storage unit power on sequence or a storage unit force power off
sequence. This switch is applicable only when the local/remote switch is set to
local. You can access this switch by opening the rear cover of the unit. Planning
requirements: None.
Note: To activate this switch, press and hold it for 8 seconds.
v Unit emergency power off switch
(Available on all models) Use this switch only in extreme emergencies. Using this
switch often results in data loss. If activated, the unit emergency power off (UEPO)
switch causes the individual model rack to immediately drop all power,
including any power that is provided by the battery system. When active, this
switch overrides all other power controls for the specific rack. This switch is
located on the front of each model rack. Planning requirements: None.
The following power controls can be configured by an IBM service support
representative. You can also use the following power controls through the DS
Storage Manager (running on the Management Console):
v Local power control mode
(Visible in the DS Storage Manager) You cannot change this setting in the DS
Storage Manager. This mode is enabled when the local/remote switch on the
storage unit is in the local position. When this setting is used, the local power
on/local force power off switch on the storage unit controls the power. Planning
requirements: None.
v Remote power control mode
(Visible in the DS Storage Manager)If you select the Remote power control
mode, you choose one of the following remote mode options. Planning
Chapter 1. Introduction to IBM System Storage DS8000 series
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