HP 9000 712/80: Up to how many peripherals?

HP 9000 712/80: Up to how many peripherals?

Post by Ramon J. Hontano » Fri, 21 Jun 1996 04:00:00



We have an HP 9000 712/80 which already has a few external disks/tape
drives attached to it, but we have a need for yet another disk.  The
SCSI-II chain currenty looks like this:

ID#     Device
---     ------
3       4mm tape drive
4       1 GB HP drive   (A2657A)   (all drives single-ended SCSI-II)
5       2 GB HP drive   (A2656A)
6       2 GB HP drive   (A2656A)

The question is: can we add another (1 GB) HP disk as SCSI-ID# 7 ?
If so, will the system's I/O performance deteriorate drastically?

If anybody has a scenario similar to this, I'd love to compare notes.

Thanks!

-- ramon
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HP 9000 712/80: Up to how many peripherals?

Post by Mark Sitkowsk » Sat, 22 Jun 1996 04:00:00



> ID#     Device
> ---     ------
> 3       4mm tape drive
> 4       1 GB HP drive   (A2657A)   (all drives single-ended SCSI-II)
> 5       2 GB HP drive   (A2656A)
> 6       2 GB HP drive   (A2656A)

> The question is: can we add another (1 GB) HP disk as SCSI-ID# 7 ?
> If so, will the system's I/O performance deteriorate drastically?

Isn't SCSI ID 7 reserved for the CPU?

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Mark

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HP 9000 712/80: Up to how many peripherals?

Post by Paul T Hiro » Sat, 22 Jun 1996 04:00:00


Quote:>The question is: can we add another (1 GB) HP disk as SCSI-ID# 7 ?
>If so, will the system's I/O performance deteriorate drastically?

Yes you can add another scsi-id, although not as numbr 7- I beliv by
default, the scsi-controller is id#7 on a 712.  You might be able to use
other free slots, if you have any (numbers 0-6).  If not, you're stuck,
unless you start using some strange mechanism regarding LUN's and whatnot,
which I don't particularly understand (never having hada to do this).

As for whether it'll impact performance or not, who knows...depends on
how what your disk pattern is like.  A scsi-2-se is 10Mb/s...given the
number of disks you have, you might hit that limit if you do some large
accesses.  Depending on cost considerations, you might bite the bullet
and get a singel 4Gb barracuda or something.  It'll help in future expansion
and you might be able to move some data from your other disks onto this one.
Of course, reducing the number of spindles might not be a good idea but
it might depending on again, your access pattern.

PH

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1. FS $350: HP 9000 712/80 HP/UX (9.03) UNIX RISC Workstation 1.44 flop/32m/SCSI

FS $350:
HP 9000 712/80 HP/UX (9.03) UNIX RISC Workstation  1.44 flop/32m/SCSI
  Included:
     SCSI drive,
     32 meg RAM,
     1.44 floppy,
     HP keyboard and mouse.

NOTE:  no CRT included

Cosmetically just fine, pristine KB & mouse.
  Operation guaranteed  (checked before shipping)
  Works with any SVGA 17" monitor
      at screen resolutions of 640x480 to 1024x1280
Years of manufacture =  '96, '97, '98

HP 9000 712/80 HP/UX (9.03) UNIX RISC Workstation  1.44 flop/32m/SCSI  $350
    With  64mBy RAM,           - add  $110
    With 128mBy RAM,           - add  $195
Individually:
    32mBy RAM SIMMS                   $ 49
    VRAM module A2263-66520           $ 49
    External 1M SCSI-II cable         $ 15

We will ship anywhere you wish in the world.

For tech details, and pictures of this model, please see:  
   1  http://www.abcworks.co.uk/hp/712ds.html,
   2  http://www.preferred.co.uk/external/712.htm  
   3
http://open.specbench.org/osg/cpu95/results/res96q1/cpu95-960131-0012...

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