Xref: utzoo comp.sys.att:2055 unix-pc.general:148
Path: utzoo!utgpu!water!watmath!clyde!mtune!shlepper!andys
From: andys@shlepper.ATT.COM (a.b.sherman)
Newsgroups: comp.sys.att,unix-pc.general
Subject: Re: More HD on my 3b1.  How?
Summary: One drive only, no SCSI
Keywords: Tired of 'Maytag Mode'
Message-ID: <176@shlepper.ATT.COM>
Date: 12 Jan 88 16:41:55 GMT
References: <287@flatline.UUCP>
Organization: AT&T Bell Laboratories, Middletown, NJ
Lines: 40

In article <287@flatline.UUCP>, erict@flatline.UUCP (eric townsend) writes:
| I'm running a 3.5Mb, 67Meg 3b1, Unix 3.0, and I want to put at least
| one more hard drive on it.  I think it is *theorhetically* possible,
| we did it with a Motorola S8000 w/ no problems.  Just stuck it on the
| open card, and did a mount.  Well, there was more to it than that, but...
| 

It is theoretically impossible.  The disk controller is ST-506, and
there is only a data bus connector for one drive.  Period.  (I looked).

| Specifically:
| 
| 2. If the drive's SCSI, which I think it is, how can I get unix to
|    recognize more than the 65 megs that it does?  I have a 72Mb
|    Hitachi in this one, that's 7 more megs than I'm 'allowed'.
| 

The drive is not SCSI, it's ST-506.  The machine has a hardware limit of
8 heads and 1024 cylinders.  Someone else has posted a hardware/firmware
upgrade to increase this.  (Send email to cmv@looney for more
information.)

| 3. If I do crank this up to two or more HD's, at what price?  Will
|    the rest of my system grind to a halt while waiting on daisy
|    chained hard drives?
| 
| Note that I'm not a hardware genius, and would prefer a "Buy part X,
| unhook your drive, hook up part X, your drive, and the new drive and reboot"
| answer...:-)

Your best bet is to put the largest drive possible on the system.  That
is 80Meg (67Meg formatted) unless you do the hardware change.  You can't
do anything else, because the hardware won't support it.  The /dev
entries for a second drive are there for the Convergent miniframes used
to develop software for the beast.
-- 
Andy Sherman / AT&T Bell Laboratories (Medical Diagnostic Systems)
480 Red Hill Road / Middletown NJ 07748 / (201) 615-5708
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