Compaq EK-SMCPO-UG. C01 manual Pedestal Components, StorageWorks Building Blocks SBBs

1-6RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide

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