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Conference ssag::ask_ssag

Title:Ask the Storage Architecture Group
Notice:Check out our web page at http://www-starch.shr.dec.com
Moderator:SSAG::TERZAN
Created:Wed Oct 15 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6756
Total number of notes:25276

6497.0. "HSZ50 + 16-bit I/O module shelf" by GOYA::GALAN () Wed Mar 19 1997 13:58

    Hi everybody.
    
    I know we are configuring BA3** shelves attached to HSZ50 with the
    8-bit personality module, because the controller is 8-bit at this
    moment. In this way the shelf can connect VA and VW disks.
    
    Apart of this, and looking at the AS4100 systems we are delivering
    (there is a KZPAA connect by a BN21N to a 16-bit shelf), I'd
    like to know if we can configure the HSZ50 using the
    16-bit I/O module and the special cable, like:
    
    HSZ50 ------------------- BA3**shelf + BA35X-MH (16-bit I/O module)
          BN21N-xx cable
    
    I want to prepare the shelf for 16-bit controllers, and I think the
    BN21N cable can do the transition between the 8-bit and the 16-bit.
    
    What do you think of this? Is this supported at this moment? Why not?
    
    Thanks,
    Ana Galan
    PreSales Technical Support Ayr - Scotland
T.RTitleUserPersonal
Name		DateLines
6497.1OTOOA::LAVIGNEWed Mar 19 1997 14:132
    I don't think it is supported nor do i think it would work.  The HSZ50
    is narrow to the drives and that is why it needs an 8 bit I/O module
6497.2Might work or Will workUTRTSC::VISSERWed Mar 19 1997 14:2722
    
    .0
    
    1. The 'trick' with KZPAA, BA356, 16-bit pers. Mod and BN21N has shown
    	to work, BUT this does NOT imply it's supported.
    	The issue here: The unused UPPER Byte of the Wide shelf is ONLY
    	terminated on ONE end. According to the SCSI-specs this MIGHT BE
    	ALLOWED, IF this length is less than 1 meter (which it is).
    	Leaves you with the issue: Suppose you run into some nasty
    	problems, where Storage Engineering has to be involved, WHAT WILL
    	THEY SAY? My guess: They say: not supported, becuase we have the
    	8-bit Pers. Modules specially for these configurations.
    	
    
    2. BA356, 16-bit Pers. Mod., BN21N and HSZ40. 
    	Same applies as at 1., BUT the HSZ release notes CLEARLY say
    	8-bit personality Module. Will a 16-bit Pers. Module work?
    	It MAY work. And if you found it does NOT work (properly), WHO are
    	you going to call?
    
        			Jan Visser.