IBM EXP15 Hardware Maintenance Manual

Also see for EXP15: Installation and User Handbook

Drive NumberingThere are two SCSI channels (1, 2) in the expansion unit.Each channel uses five SCSI ID numbers. Each disk drivewithin the expansion unit has a unique channel numberand SCSI ID number, based on its physical location in theexpansion unit.When a drive is plugged into the midplane, its channelnumber and SCSI ID are set automatically. See thefollowing illustration for bus and SCSI ID values whenoption switch 1 is set to the on (up) state. Use the optionswitch on the ESM board to change the ID settings.(1,0) (2,0) (1,1) (2,1) (1,2) (2,2) (1,3) (2,3) (1,4) (2,4)The first number represents the channel number and thesecond is the SCSI ID.NotesFor IBM ServeRAID, the view configuration screensshow bay numbers, not SCSI IDs. To calculate thebay number, add 1 to the SCSI ID.A blank label is provided in the drive tray behind thedrive latch. Use this label to record the addresslocation information for each drive before you removeit. If you install a drive in the wrong bay, data will belost.If you are replacing a drive that is part of a RAID level1 or RAID level 5 logical drive, ensure that you installthe replacement drive in the correct bay. Failure toreplace the drives in their correct bays can result inloss of data.If the two channels are daisy chained using option switch 1in the off position, then the SCSI IDs are as shown and thedrives are all on the same channel.(1,0) (1,8) (1,1) (1,9) (1,2) (1,10) (1,3) (1,11) (1,4) (1,12)Netfinity EXP15 Type 3520 13