CompuServe Messages

Ron, LUN's are additions to SCSI ID's. You can have a LUN of 0 to 7 just like you can have SCSI ID's of 0 to 7. Since the host adapter always has a LUN of 0 and no other device should share that SCSI ID, then in theory.. for the other 7 SCSI ID's, you could have 8 devices each for a total of 56 devices attached to a single SCSI bus. In practice…that'd be foolish, along with the fact that 'consumer' SCSI devices typically don't have jumpers to set the LUN, they're hard wired at 0, or at best a single jumper to allow a LUN of 0 or 1. From my experience…a typical device that uses LUN's would be a bridge controller that converts one type of interface to another. For example, on some of our UNIX mini's here at work, we have multiple ESDI drives attached to a single ESDI-SCSI bridge controller with each drive tap on the bridge (there are 4 taps on the bridge controller) having a different LUN, but the bridge only taking up one SCSI ID. It's a rare day when you find a single drive with a LUN jumper. Don