Adaptec 29320A-R User Guide - Page 26

Adaptec Ultra320 SCSI Cards User's Guide s Termination on SE internal SCSI devices is usually controlled by manually setting a jumper or a switch on the device, or by physically removing or installing one or more resistor modules on the device. s Termination on most external SCSI devices is controlled by installing or removing a SCSI terminator. However, termination on some external SCSI devices is enabled or disabled by setting a switch on the back of the SCSI device. s By default, termination on an Adaptec SCSI Card itself is set to Automatic (the preferred method). We recommend that you do not change this default setting. This automatic setting is just for the Adaptec SCSI Card itself; the card cannot change the termination setting on a device. s Internal and External Ultra320/Ultra160 and Ultra2 SCSI LVD SCSI buses must be terminated with an LVD terminator. This is sometimes referred to as an LVD terminator or a Multimode terminator. Defining RAID RAID (Redundant Array of Independent Disks) offers data protection, outstanding data availability, excellent performance, and high capacity. A RAID is defined as: s Unified array-Two or more hard drives are grouped to appear as one single device to the host system while operating independently of one another. s Fault-tolerant redundancy-If one drive fails no data is lost. (RAID 0 is an exception to this definition because RAID 0 is not fault tolerant. See Supported RAID Levels.) 1-10