Compaq ProSignia 300 SMART-2DH Array Controller Reference Guide - Page 130

C-2 Things You Should Know SCSI Termination All SCSI buses require termination on both ends of the bus to prevent signal degradation. The SMART-2DH Controller supplies the termination on the origination end of the SCSI bus. All internal SCSI cabling recommended for Compaq servers provides the necessary termination for the opposite end of the bus. Therefore, individual SCSI drives in Compaq servers should not contain bus termination. External SCSI devices must also provide termination for the SCSI bus. This is supplied in Compaq external storage systems such as the ProLiant Storage System or SCSI Storage Expander. Therefore, individual SCSI drives in Compaq storage systems should not contain bus termination. SCSI IDs The SMART-2DH Controller contains two SCSI buses (ports), each of which supports up to seven drives. The internal and external connectors reside on separate SCSI buses; peripherals attached to either connector must have a unique SCSI ID in the range of 0 to 6. SCSI IDs on all peripherals are set manually with switches or jumpers on the device itself, or set automatically on Compaq products that support hot-pluggable drives. The SCSI ID determines the device's priority when attempting to use the SCSI bus. The highest priority, SCSI ID 7, is reserved for use by the controller. SCSI IDs 8 to 15 are not currently supported by the SMART-2DH Controller. SCSI Cabling The cables available from Compaq that connect your SMART-2DH Controller option board to SCSI drives in any Compaq server or external SCSI product can be found: s in the SMART-2DH Array Controller Installation Guide, or s at www.compaq.com/products/servers/servername/scsicableguide.html, or s in the Setup and Installation Guide, or Reference Guide, that accompanied your server. Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002 File Name: J-APPC.DOC Last Saved On: 2/27/98 12:03 PM COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED