User`s guide

1-6 RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide Comments:
Part Number: EK-SMCPO-UG. C01 File Name: b-ch1 Product Overview.doc Last Saved On: 12/4/00 1:51 PM
Pedestal Components
The major components in the pedestal subsystem include:
■ Dual-channel RAID array controller
■ Two 16-bit single-ended split SCSI buses
■ Environmental Monitor Unit (EMU)
■ Two universal 50/60 Hz, 120 or 240 VAC power supplies
■ Separate free-standing backup power supply (UPS)
StorageWorks Building Blocks (SBBs)
The pedestal has seven 3½-in 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.
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
32 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 64 MB while a redundant setup has a maximum usable cache of 32 MB (per
controller).
The RAID Array controller contains the following features:
■ Single PCB form factor for inclusion in the enclosure
■ Support for dual hot-swap controller operation
■ Dual differential Ultra-Wide SCSI host channels
■ Dual single-ended Ultra-Wide SCSI disk channels
■ RAID level 0, 1, 0+1, 4, 5, and JBOD support
■ EMU support
■ Cluster support for Windows