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From: thompson@PAN.SSEC.HONEYWELL.COM (John Thompson)
Newsgroups: comp.sys.apollo
Subject: re: SCSI disks / DN3k/4k nodes
Message-ID: <9105282148.AA21579@pan.ssec.honeywell.com>
Date: 28 May 91 21:48:28 GMT
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> Has anyone successfully hooked up a SCSI hard disk to an HP/Apollo
> DN3xxx/4xxx machine ?
Probably not.  We certainly haven't.
 
> We are looking to expand our mass storage capability, but we are getting
> conflicting information from various groups within HP/Apollo concerning
> SCSI support for the DN3k/4k series workstations.
God only knows who in HP/Apollo is giving you a 'maybe you can' answer. 
You can't add SCSI devices to the DN3x00 / DN4x00 / DN5x00 series machines,
unless HP/Apollo has made a _RADICAL_ change of policy.  I know that Mentor
(and probably 3rd party) has a SCSI board that sits in the AT-bus, and you
cand access it if you use the special driver that's provided, but that will
NOT give you disk services.
The best (biggest) you can do with a DN3000 is a 325MB drive (Maxtor?).  
If you get a motherboard up-rev (to God knows what revision), the DN3500/
4000/4500 can take the WD7000 controller, which has a SCSI bus on it.  
However, you can only hook up SCSI tape drives, floppies, and CD-ROMs as 
far as I know.  Maybe you can hook up a WORM or r/w optical, which might 
account for the information conflict.  The best (biggest) drive you can hang
off a WD7000 is the Maxtor 760MB ESDI drive (Maxtor XT8760E), which'll give
you 650MB formatted space.  You can put 2 drives per controller, and 2 
controllers per node, for 2.6GB of space.  I think you'll find that the 
up-revs you'll need will be too pricey though.  Probably better to go with
a 9000/400 series node (maybe the 425E, if you have ethernet).  You can hang
about 9 GB of SCSI off of a 'E' or 'T' type 400 series, and 27 GB from an
'S' type 400 series (3 SCSI controllers, 6 SCSI drives per, 1.5 GB per).
                                                   
> "...you know I have the greatest enthusiam for the mission." HAL 9000
                                           ^-- please fix.  :-)

Good Luck -- hope this helps.

-- jt --
John Thompson
Honeywell, SSEC
Plymouth, MN  55441
thompson@pan.ssec.honeywell.com

When in danger, when in doubt --
run in circles, scream and shout.