The following notes provide additional information about the labeled components
in Figure 1.
1. All base models contain a fan sense card to monitor fans in each frame.
2. The rack power area of the base models provides redundant power supplies
(two primary power supplies, PPSs), power control cards, and backup battery
assemblies to help protect data in the event of a loss of external power. Model
941 (2-way processor) contains two batteries (for extended power line
disturbance (EPLD) or non-EPLD). Model 941 (4-way processor) contains three
batteries (for EPLD or non-EPLD) to support the 4-way processors.
3. All base models can have up to eight disk enclosures, which contain the disk
drives. In a maximum configuration, each base model can hold up to 128 disk
drives.
4. All base models contain one management console comprised of a keyboard and
display or laptop.
5. All base models contain two processor enclosures. Model 941 (2-way) processor
enclosures have 2-way processors. Processor enclosures on Model 941 (4-way)
have 4-way processors.
6. All base models contain I/O enclosures and adapters. Model 941 can be equipped
with either two- or four-way I/O enclosures. The I/O enclosures hold the
adapters and provide connectivity between the adapters and the processors.
Both device adapters and host adapters are installed in the I/O enclosure.
The EPLD is an optional feature, it temporarily maintains power for the entire
subsystem up to 60 seconds to minimize the impact of the power line disturbance.
This feature is highly recommended for areas where power source is not reliable.
This feature requires additional hardware:
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Figure 1. A Model 941 (2-way processor with the front cover off) and its main components
2 Introduction and Planning Guide
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