H162824: CONFIGURING SCSI REPEATERS IN THE 3518 ENCLOSURE TEXT: A SCSI Repeater Card Option p/n94G7585 FRU p/n07L8624 is required when configuring any IBM External Enclosure type 3518 Model 001 or 002 with ANY of the following configurations on a single SCSI Channel: - Supported external SCSI cable greater than 1 Meter Long. - Daisy-Chaining of Backplanes inside the 3518. - More than six (6) Hard Drives inside the 3518. 3518 CONFIGURATION LIMITATIONS/REQUIREMENTS: 1- If attaching the 3518 to a Non-RAID Ultra-Wide SCSI Controller/Adapter, the ULTRA setting on the Controller/ Adapter MUST BE DISABLED. 2- Ultra Speed is NOT supported on the 3518 Enclosure. 3- The MAXIMUM Configuration of a Single SCSI Channel WITHOUT a REPEATER in a 3518 Enclosure is: - one (1) supported Hot-Swap Backplane. - six (6) supported slim-high Hard Drives OR three (3) supported half-high Hard Drives. - A single supported 1 Meter external SCSI cable. - Six (6) Half-High HDDs can be installed on a single channel without a repeater by daisy-chaining two backplanes. 4- The MAXIMUM Configuration of a Single SCSI Channel WITH REPEATER (Option p/n94G7585/FRU p/n07L8624) in a 3518 Enclosure is: - two (2) supported Hot-Swap Backplanes (daisy-chained). - twelve (12) supported slim-high Hard Drives (six (6) per Backplane). - A single supported 4.3 Meter external SCSI cable. ---------------- OR -------------------------------- - three (3) supported Hot-Swap Backplanes (daisy-chained). - nine (9) supported half-high Hard Drives (three (3) per Backplane). - A single supported 4.3 Meter external SCSI cable NOTE: Daisy-chaining Backplanes in the 3518 requires that the 3518 is connected to any of the following Adapters / Controllers: - ServeRAID Adapter - ServeRAID II Adapter / Controller - PCI Ultra Wide SCSI Adapter / Controller See the following IBM Website URL for 3518 System Compatibility and Hardware Prerequisites: http://www.pc.ibm.com/us/products/catalog/31f6_6fe.html DATE: October 26, 1998