External Scsi Array Enclosures (Storage Subsystems) - Adaptec AAA-133U2 - AAA 133 RAID Controller Hardware Manual

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AAA-130U2 Series Installation and Hardware Guide

External SCSI Array Enclosures (Storage Subsystems)

To help you conveniently manage your SCSI storage subsystems, a
variety of external array enclosures are available from different
manufacturers. Figure 2-16 shows a typical setup between the array
enclosure and the system. To install your SCSI devices in these
enclosures, refer to the enclosure's documentation. The following
information is provided to help you properly connect your
enclosure to the system: (See the Adaptec Web site at
http://www.adaptec.com/raid for a list of popular array storage
enclosures and disk drive manufacturers.)
All rules for SCSI ID and termination must be followed when
installing SCSI device in an array enclosure.
Ideally, the array enclosure itself should provide termination
capability, either on the SCSI backplane or with an attachable
active terminator, as shown in Figure 2-16, and you should dis-
able termination on all the drives in the enclosure. If you termi-
nate the SCSI bus by enabling termination on a drive, you may
run into problems if you have to replace that drive and you
then forget to terminate the replacement drive.
If the enclosure you are using for the array drives is not specif-
ically designed as a array enclosure (such as a standard tower
unit), be sure it has adequate cooling and ventilation.
Active Terminator
Figure 2-16. A Typical Array Enclosure Setup
2-18
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