NEC S1300 User Manual page 16

This Manual:http://www.manuallib.com/nec/s1300ug-disk-array-unit-user-guide.html
The DAU includes the following major features:
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2.0 Gigabit per second data transfer rate .
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High bandwidth for demanding applications.
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The ability to share storage assets among many workstations.
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Easy cabling to host bus adapters.
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Hot-swap hard disk drive bays accessible from the front of the chassis. The drives
can be swapped in or out of the DAU without powering it down. The bays support
up to fifteen hard disk drives. Disk drives are high performance 10,000RPM and
15,000RPM hard disk drives connected to a high speed Fibre Channel-Arbitrated
Loop (FC-AL) disk drive interface. Drive capacities are 36GB, 73GB or 146GB.
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Hardware monitors (temperature, fans, and voltage) and software monitors to
indicate failures.
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LEDs to provide failure notifications.
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Support of RAID levels 0, 1, 5, and 10. If a fault occurs in a single disk module, the
DAU can continue the operation without loss of data (except RAID level 0).
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Battery-backed cache memory to ensure high-speed data processing.
The DAU system is designed for minimum downtime. Thus, the DAU contains the
following:
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A more reliable and flexible storage architecture that helps ensure continuous data
availability.
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Two power supplies for power system redundancy. With two power supplies, the
DAU will continue to operate with a single power supply failure. The self-contained
power supply units can be easily and safely hot-swapped from the rear of the chassis
without shutting down the DAU.
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Dual controllers, each containing cache memory. Cache memory data is protected by
battery backup units, to retain write data in the event of a system shutdown or power
failure.
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Fibre Channel disk drive bays accessible from the front of the chassis.
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Hot-swap Fibre Channel disk drive backplane, supporting fifteen drives. A failed
drive can be removed and a new drive installed without turning off system power.
Disk Array Unit Overview 1-3