CONFIGURING SCSI REPEATERS in the 3518 ENCLOSURE

Subject: CONFIGURING SCSI REPEATERS in the 3518 ENCLOSURE
New Netfinity server RETAIN Tip:  (this replaces H162824)

    Record number:       H165084
    Device:              D/T3518
    Model:               M
    Hit count:           UHC00055
    Success count:       USC0000
    Publication code:    PC50
    Tip key:             001
    Date created:        O98/10/30
    Date last altered:   A98/10/30
    Owning B.U.:         USA


Abstract: CONFIGURING SCSI REPEATERS in the 3518 ENCLOSURE

TEXT:

A SCSI Repeater Card Option P/N 94G7585 FRU P/N 07L8624 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 so that the number of installed drives can exceed six (6).
•  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/N 94G7585 / FRU P/N 07L8624) 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/compat/storage/matrix.shtml#enclose

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