IBM 86655RY Hardware Maintenance Manual - Page 193

Note: ServeRAID-4H controllers have 4 channels; ServeRAID-4L controllers have only one channel; and ServeRAID-4M controllers have 2 channels. Table 20. SCSI identifier. SCSI Channel Code (z) 1 2 3 4 5 6 7 8 9 A B C D E F Channel 1 Channel 2 Channel 1 & 2 Channel 3 Channel 1 & 3 Channel 2 & 3 Channel 1, 2, & 3 Channel 4 Channel 1 & 4 Channel 2 & 4 Channel 1, 2, & 4 Channel 3 & 4 Channel 1, 3, & 4 Channel 2, 3, & 4 Channel 1, 2, 3, & 4 Descriptions b. Confirm that the channel(s) identified from the error in step a on page 182 is (are) the cause of the error by verifying that the error presents itself ONLY when the offending channel is reconnected. c. Check termination of identified channel. Note: Refer to the HMM (Hardware Maintenance Manual) specific to the system comprising the SCSI channel for termination details. d. Check for proper backplane jumper configuration. Note: Refer to the HMM (Hardware Maintenance Manual) specific to the system comprising the SCSI channel for jumper details. e. Check for proper cabling configuration in systems that use DASD status cables. Reconnect all cables removed in step 1 above. f. Disconnect one drive at a time attached to the channel identified in step a on page 182; then, reboot to determine which drive is causing the error. g. Replace SCSI cable. h. Replace SCSI backplane. FFFF or other code not listed 1. Isolate between SCSI Subsystem and controller by disconnecting all SCSI cables attached to the suspect card, and reboot. CAUTION: Do not press F5. Doing so will change the customer's configuration. Installing and configuring ServeRAID controllers 183