HP Workstation xw6000 Adaptec SCSI RAID 2120S: Installation Guide - Page 23

Adaptec SCSI RAID 2120S/2200S Installation Guide SCSI Cables Adaptec recommends using Ultra 320 SCSI devices and good quality (or better) LVD SCSI cables designed and rated for Ultra 320 use. These can be purchased from Adaptec at www.adaptec.com. Using cables not rated for Ultra 320 operation may adversely impact the performance of your system. SCSI Device IDs The SCSI specification allows up to 16 devices (one has to be the controller) to be connected to a SCSI channel. Narrow SCSI devices only support a maximum of 8 devices, and may be attached using appropriate convertors for each device. Be aware that narrow devices are almost always SE. All SCSI devices, including the controller, must be assigned a unique SCSI ID. SCSI IDs, which are typically set using jumpers or switches on peripheral devices, can be assigned any number from 0 to 7 for 8-bit SCSI devices or 0 to 15 for Wide SCSI devices. Since devices used with the Adaptec SCSI RAID controller should be LVD, the SCSI ID of each device will be a unique number between 0 and 15. The Adaptec SCSI RAID controller is set to ID 7 by default (most SCSI controllers use ID 7). SCSI IDs can only be duplicated on the same controller if the devices using the same ID are 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 is inserted. No setting of the ID is necessary when using drives with such an enclosure unless your enclosure requires it. Consult the enclosure documentation if you need assistance. The Adaptec SCSI RAID controller ID can be changed to any ID from 0 through 7. Use ARC to change the controller SCSI ID. Note: Unless changing the controller ID is essential to system operation, it should be set to SCSI ID 7. 2-4