Adaptec RAID 2120S Installation Manual

Also see for 2120S - SCSI RAID Controller: User guide Installation guide Installation guide Installation and user guide Software reference guide

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Adaptec RAID 2120S Installation Manual Manual pdf 23 page image

2-4Adaptec SCSI RAID 2120S/2200S Installation GuideSCSI CablesAdaptec recommends using Ultra 320 SCSI devices and goodquality (or better) LVD SCSI cables designed and rated forUltra 320 use. These can be purchased from Adaptec atwww.adaptec.com. Using cables not rated for Ultra 320 operationmay adversely impact the performance of your system.SCSI Device IDsThe SCSI specification allows up to 16 devices (one has to be thecontroller) to be connected to a SCSI channel. Narrow SCSI devicesonly support a maximum of 8 devices, and may be attached usingappropriate convertors for each device. Be aware that narrowdevices are almost always SE.All SCSI devices, including the controller, must be assigned aunique SCSI ID. SCSI IDs, which are typically set using jumpers orswitches on peripheral devices, can be assigned any number from 0to 7 for 8-bit SCSI devices or 0 to 15 for Wide SCSI devices.Since devices used with the Adaptec SCSI RAID controller shouldbe LVD, the SCSI ID of each device will be a unique numberbetween 0 and 15. The Adaptec SCSI RAID controller is set to ID 7by default (most SCSI controllers use ID 7). SCSI IDs can only beduplicated on the same controller if the devices using the same IDare not attached to the same controller channel.SCSI enclosures, using SCSI drives with 80 pin SCA connectors,typically assign the drive ID automatically when the drive isinserted. No setting of the ID is necessary when using drives withsuch an enclosure unless your enclosure requires it. Consult theenclosure documentation if you need assistance.The Adaptec SCSI RAID controller ID can be changed to any IDfrom 0 through 7. Use ARC to change the controller SCSI ID.Note: Unless changing the controller ID is essential to systemoperation, it should be set to SCSI ID 7.