Conference wrksys::mikasa

    
    
     By default the system is shipped with the ENTIRE backplane connected.
    Hence all 7 slots are active. By default there is one removable, an
    RRD46 CDROM. The CDROM is usually SCSI ID 4 (by default) and hence the
    corresponding slot in the backplane cannot be used, otherwise you will
    have two SCSI devices with the same ID (very bad!). Hence all the
    storage shelf slots are usable except the ones that have the same ID as
    the removable media you have present in the system.
    
     The comment on extending the bus and the Active terminator is true.
    
     AS far as addition SCSI controllers and cables go.
    
     The KZPAA is a narrow controller and if you want you could plug that
    in and use the internal Narrow cable (ie..unplug from MLB and plug into
    the option) to connect to that option. In that case the Removables
    would be on a narrow and the bus length out the back could then be
    longer outside. In this case the removables and external devices would
    be connected to the option and the entire FWSE storage shelf is usable
    by the onboard SCSI controller. No cable kits needed.
    
     If you get another FWSE option card, and want to use the internal
    storage shelf ( split backplane) then you need to order the PB7HA-BA
    kit that includes all the cables and terminators.
    
    When split, the top 4 diska are one bus, the bottom three are aonther
    like you stated.
    
    
     Did I leave anything out ?
    
     Leon
     
    

    Leon,
    
    Thank you for the information.
    
    By the way, I am trying to configure the system & do not have 
    either a system or the manuals with me. Therefore, I would need to 
    bother you with some more questions on this.
    
    1. For a basic config, without a KZPAA or KZPSA, do I need to 
       order a PB7HA-xx kit, or all the cables bundled ?
    
       In the case of the basic config, this means that if I have a 
       CDROM (SCSI ID 4) and a tape drive (SCSI ID 5), then in the 
       shelf, I can use the first 3 slots (from the top) with SCSI IDs 
       1,2,3. Then I skip, the next 2 slots (SCSI IDs used by the 
       CDROM & tape drive) and then use the last 2 slots. All these 
       would be connected to the internal FWSE controller by a wide 
       cable. And I can use wide devices in the shelf. Is that right ?
    
    2. >>in and use the internal Narrow cable (ie..unplug from MLB and
    
       I am confused a bit here. Does it mean there is a narrow cable 
       set and a wide cable set bundled with the system. (And by the 
       way what is MLB ?)
    
    Can you please clarify these points ?
    
    Thanks in advance.
    
    Nandan

    
    1. For a basic config, without a KZPAA or KZPSA, do I need to 
       order a PB7HA-xx kit, or all the cables bundled ?
    
       In the case of the basic config, this means that if I have a 
       CDROM (SCSI ID 4) and a tape drive (SCSI ID 5), then in the 
       shelf, I can use the first 3 slots (from the top) with SCSI IDs 
       1,2,3. Then I skip, the next 2 slots (SCSI IDs used by the 
       CDROM & tape drive) and then use the last 2 slots. All these 
       would be connected to the internal FWSE controller by a wide 
       cable. And I can use wide devices in the shelf. Is that right ?

 $$$$$$ What you state is almost correct :) The storage shelf will 
        start with SCSI ID 0, hence you will use the first 4 slots,
        which are SCSI ID 0,1,2,3 respectively. Skip the next two
        slots which are IDs 4 and 5, and use the last slot which is
        SCSI ID 6. The controller by default is ID 7.
        And Yes you may use Wide devices in the storage shelf, and in
        fact we encourage it. The AS1000A was designed for FWSE devices
        in the  storage shelf. The system comes with all the cables and
        terminators assuming the tape drive is in the enclosure and not 
        external.
     
    2. >>in and use the internal Narrow cable (ie..unplug from MLB and
    
       I am confused a bit here. Does it mean there is a narrow cable 
       set and a wide cable set bundled with the system. (And by the 
       way what is MLB ?)

 $$$$$$ on the AS1000A, there are two SCSI connectors on the Main logic
        board (MLB).  There is a fast-wide cable (68 pin connector) that
        goes to the internal storage shelf, and a narrow cable (50-pin connector)
        that goes to the 2 removable devices and out to the back bulkhead.
        Note, this is all one bus, and both ends must be terminated with
        an Active terminator. By default, both cables are plugged into
        the MLB. But in the case where you add a KZPAA, if you wanted to
        you could unplug the "narrow" from the 50-pin connector on the
        system MLB, and connect it directly to the KZPAA option card.
        In this case, the removables and the bulkhead connector are now
        connected to the KZPAA and not the system SCSI BUS. This configuration
        can be useful for people who want to add extra table top 
        tape drive using the bulkhead connector. This configuration with 
        KZPAA also frees up the previous 2 unused slots in the storage shelf, 
        since those SCSI IDs are now available since the CDROM and Tape
        changed to be off the KZPAA SCSI Bus.

 $$$    There are a few different ways to connect up the Storage shelf
        and the internals based on what options people decide to add.
        The basic ones are in the Service manual and owners guides and
        I strongly recommend people get these and read them :)

 $$$$  As far as the KZPSA, which is a Fast wide differential option,
       this option can only be connected to an external storage box,
       and I personally don't know what cables are needed for the
       KZPSA option. (sorry) 

  $$ leon

    
    Leon,
    
    Thank you for that most descriptive answer.
    
    Nandan