Adaptec 3940UW User Guide - Page 60

Because PowerDomain 2940UW/3940UW accelerator cards

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PowerDomain 2940UW/3940UW User's Guide Setting SCSI Chain Termination Termination circuits must be either installed in or enabled on the first and last physical devices of the SCSI chain; otherwise, the chain will not operate properly. Incorrect termination can cause numerous problems such as missing drives, system error messages, applications reported as bad, failure to restart, or system hangs during restart. Because PowerDomain 2940UW/3940UW accelerator cards support fast SCSI-2 transfers, they use a special form of termination: active termination. This termination is designed for the faster transfer rates of Fast SCSI-2 drives. Many drive manufacturers supply hard disk drives with passive terminators, which you must remove before you can safely use the drive with the PowerDomain 2940UW/3940UW. If you are using Fast SCSI-2 drives, check the documentation that came with the drive to determine if your hardware has active termination. If you are unsure, contact the supplier of your hard disk drive; the supplier should be able to assist you. To set termination on a SCSI chain 1 Determine which two SCSI devices, including the PowerDomain 2940UW/3940UW, are at the two ends of the SCSI chain. Then refer to the SCSI device documentation for instructions on enabling termination for these devices. 2 Disable termination on all other devices on the SCSI chain. Note: Some SCSI devices have internal terminators. You should place these devices at the end of the SCSI chain, if possible; remove the terminators yourself; or have a qualified technician remove them for you. Read the following sections for more information about changing termination settings. 2-48 AAAAAAAAAAAAAAAAAPSPCAAAAAArotuoiAAAwrncAAArtekAAAeSrAAAnNDAAAptAAAeuoDAAAcmmAAAaAAANtbaeAAAieu:AAAnrmAAA2:2AAA/5bAAA921eAAA04r0AAA/0:AAA98U4AAA66AAA9W4AAA3-AAA0/7AAA304AAA9,2AAA4R-AAA00AAAeU0AAAvAAAW.AAABAAAAAAUAAAsAAAeAAArAAA'AAAsAAAEGAAACAAAuAAANiAAAdAAAeDAAAAAAaAAAPtAAAeaAAA:gAAA2AAAe/AAA:2AAA27AAA-/AAA49AAA86AAAAAAAAAAAAAAAAAAAA

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2-48
PowerDomain 2940UW/3940UW User’s Guide
PowerDomain 2940UW/3940UW User’s Guide
Stock Number: 510864-00, Rev. B
Page: 2-48
Print Spec Number: 493742-00
Current Date: 2/20/96
ECN Date: 2/27/96
Setting SCSI Chain Termination
Termination circuits
must be either installed in or enabled on the
first and last physical devices of the SCSI chain; otherwise, the
chain will not operate properly. Incorrect termination can cause
numerous problems such as missing drives, system error
messages, applications reported as bad, failure to restart, or system
hangs during restart.
Because PowerDomain 2940UW/3940UW accelerator cards
support fast SCSI-2 transfers, they use a special form of
termination:
active termination
. This termination is designed for the
faster transfer rates of Fast SCSI-2 drives.
Many drive manufacturers supply hard disk drives with
passive
terminators, which you must remove before you can safely use the
drive with the PowerDomain 2940UW/3940UW. If you are using
Fast SCSI-2 drives, check the documentation that came with the
drive to determine if your hardware has active termination. If you
are unsure, contact the supplier of your hard disk drive; the
supplier should be able to assist you.
To set termination on a SCSI chain
1
Determine which two SCSI devices, including the
PowerDomain 2940UW/3940UW, are at the two ends of the
SCSI chain. Then refer to the SCSI device documentation for
instructions on enabling termination for these devices.
2
Disable termination on all other devices on the SCSI chain.
Note:
Some SCSI devices have internal terminators.
You should place these devices at the end of the SCSI
chain, if possible; remove the terminators yourself;
or have a qualified technician remove them for you.
Read the following sections for more information about changing
termination settings.