Perhaps you do not have to panic about blown drives just yet. There is
usually some circuitry to handle this exact issue. Just unplug the LVD
drives from the HVD SCSI chain, sacrifice a little furry animal, say the
magic words and plug the LVD drives into an SE-SCSI chain and power on.
As for the drivers, there are 2 disk drivers, one is for all narrow SE-SCSI
drives and the other is for all Fast and Wide HDV SCSI drives and array. I
don't think the driver cares about the voltage; it probably cares more about
16 bits versus 8 bits and SCSI addresses up to 15 versus 7. But that's just
a guess.
Denys
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
Of James B. Byrne
Sent: Tuesday, January 03, 2006 8:42 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Cannot see added drives in MAPPER
> From:
On: Saturday, December 31, 2005 1:40 PM, James B. Byrne
[mailto:[log in to unmask]] wrote
>
> Is the ST318404LC low-level formated with a 512 sector size?
>
On 3 Jan 2006 at 6:16, Legault, Raymond D wrote:
> This is how my 8.5 gig are configured on a A500
>
> 50 0/6/2/0.0.0 Disk ST39173WC
> SCSI_DISK_AND_ARDISC
I do not believe that your problem is in the configuration. My
understanding is that the device IDs are used only for HPq's
diagnostics and that the actual driver software on MPE/iX is the same
for every SCSI disc drive. The critical elements are the physical
interface electrical characteristics and the low-level format of the
device in question.
My earlier comment reflects my previous experience with MPE/iX and
the HP3000 recognizing SCSI discs. As Chuck pointed out there are
other possibilities. The most damaging is if you have attempted to
connect a LVD (Low Voltage Differential) device to an HVD (High
Voltage Differential) interface. If you did this then you almost
certainly have blown the SCSI drive. Thus the drive is dead from a
data transmission interface point of view even if it powers up and
spins without complaint.
Assuming that the electrical interface specifications match and that
you are in fact using an LVD i/f card in the HP3000 with LVD SCSI
drives (did the A series ever ship with the an HVD interface?) then
remaining issue is whether the drive in question has been low level
formatted with a sector size other than 512. Drives that have been
used with IBM and Apple computers often have sector sizes of 520.
You can check this by using a low-level format utility such as those
provided by Seagate. The tool can be had at:
http://www.seagate.com/support/seatools/. You will need to have a
suitable SCSI i/f card in the computer on which you run this utility
of course.
If the drive has a sector size other than 512 then the HP3000 is
never going to recognize it. You will need to perform a low-level
format to set a 512 sector size first.
Regards,
Jim
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