Wow....7925...oh yeah, I remember. That was back when the CE could
repair the disk drive, not just replace it. The controller wasn't
soldered to anything. In fact the 7925 master was the same disk drive
as a 7925 slave. The only thing that made the 7925 a master was the
fact that a 13037 controller was sharing the cabinet with the drive.
To convert your slave to a master just move that box that's below
the drive. It isn't soldered to anything, but it is kind of heavy and
has some sharp edges, so be careful. If you would like to check out
the hardware, put a scratch (or soon to be scratch) pack in the drive,
load up the DUS (no passwords required) tape and fire up a program
called "verifier". Follow the instructions in the verifier program
giving the old monster a format and a verify. If the drive makes it
through a pass, it and the pack in it are probably ok. A recurring
AGC fault would typically indicate that the servo head is about shot
or the servo code written on the pack is lunched. It's unlikely that
all of your packs simultaneously garfed their servo code except in
the extremely unlikely event that your servo head learned to write,
even after hanging around with those 9 others that have been for the past
15 years or so. If the hardware looks good, try a coldstart with a
"recover lost disc space" before going for that reload.
Should a wiseguy on the list tell you to do something with K-Y jelly,
don't do it! The chamber housing the pack must be kept very clean.
If you would like to talk to a CE while you're checking the drive
out, you can call (410)574-4911 and ask for Bob J. Pretty smooth how
I worked that phone number in there, don't you think?
 
Hope this helps.
 
Bob Jankalski -- Ideal Computer Services
 
 
On Fri, 29 Sep 1995, Daniel Kosack wrote:
 
>   Yes, I do realize the 7925's are oldies, but I'd still like to use them
> for 'fast' removable storage...
>
>   Anyways, my question/concern.  I have a 7925 master drive, and a slave
> (don't use the slave).  The other day, when trying to install MPE/V
> again, I accidentally shutoff the unit before putting it in STOP
> position.  And ACG (AGC?) fault light went on, and I properly shut the
> system down, and the fault went away.  Now, when using the unit,
> every time I try to boot from the 7925, I get a HALT -- Uncorrectable
> Error from the 3000 midway through the boot.  I've tried 3 different disk
> packs, all seem to show the same thing.
>
>   I'm wondering... is this Uncorrectable Error a drive fault, and should
> I just pitch the thing, or could it be that I have bad disk packs?  And,
> if I need to pitch the thing, how difficult would it be for me to gut the
> master, and make the slave into a master drive?
>
>   I have a pair of Eagles recently donated to the school that I'm
> currently working off of.  The Eagles were a pain to get up and running,
> as the system seemed to crash midway through the system installation.
>
>   I'm running a S/42, with 7978 tape, currently 1 Eagle online, running
> MPE/V G.A3.07 (V Delta 7).  I don't have enough power to keep the 7925's
> and the 7937's online at the same time with the tape, so I power down the
> one set to bring up the other.  All equipment was donated.
>
>   Any help would be greatly appreciated.
>
> Thanks!
>
> Daniel Kosack -= LinuxMan =-
> Systems Operator and Internetwork Administrator.
> Systems Manager, HP 3000 and MPE services, administration.
> Walkersville High School.
>