User`s guide

RAID Array 3000 Storage Subsystem
1–6 EK–SMCPO–UG. A01
1.4 Pedestal Components
The major components in the pedestal subsystem include:
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Dual-channel RAID array controller
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Two 16-bit single-ended split SCSI buses
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Environmental Monitor Unit (EMU)
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Two universal 50/60 Hz, 120 or 240 Vac power supplies
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Separate free-standing backup power supply (UPS)
1.4.1 StorageWorks Building Blocks (SBBs)
The pedestal has seven 3½-inch disk drive SBB slots. The number of drives that
make up each configuration of the array is left to the end user with a maximum
of seven storage devices.
1.4.2 RAID Array Controller
The controller contains two Wide/UltraSCSI/differential host channels and two
Wide/UltraSCSI/Single-Ended disk channels. In dual-controller configurations,
the controllers support fully automatic and smooth controller failover.
The controller supports one or two standard 72-pin cache SIMMs of up to
64 MB. In a redundant controller setup, both controllers must have identical
cache configurations and the total usable cache (per controller) will be half the
amount installed. Thus, in a single controller setup the maximum usable cache is
128 MB while a redundant setup has a maximum usable cache of 64 MB (per
controller).
The RAID Array controller contains the following features:
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Single PCB form factor for inclusion in the enclosure
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Support for dual hot-swap controller operation
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Dual differential Ultra-Wide SCSI host channels
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Dual single-ended Ultra-Wide SCSI disk channels
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RAID level 0, 1, 0+1, 4, 5, and JBOD support
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EMU support
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Cluster support for Windows NT
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32 Logical Units (LUNs) per host channel (some operating systems may be
limited to 8)
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Support for Hot and Warm spare disks
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UPS backed write caching