[parisc-linux] 735/125 Wide Diff scsi

[parisc-linux] 735/125 Wide Diff scsi

[Richard Nairn]

Hi There,

I have a number of Seagate WD drives that I would like to put on my
735/125.  It doesn't seem to recognize them.  Is the Wide scsi chain
supported?


Thanks.
Richard

-- 
|       Richard Nairn          Specializing in Linux
|     Nairn Consulting         Web / Database Solutions
|        Calgary, AB           
| Richard@NairnConsulting.ca

Re: [parisc-linux] 735/125 Wide Diff scsi

[Matt Taggart]

Richard Nairn writes...

> Hi There,
> 
> I have a number of Seagate WD drives that I would like to put on my
> 735/125.  It doesn't seem to recognize them.  Is the Wide scsi chain
> supported?

Well if you're plugging it in to a narrow single ended bus the drive should 
fall back. If you're trying to plug it in to a wide high voltage 
differential bus that's not going to work.

So which bus does your 735 have?

-- 
Matt Taggart
taggart@fc.hp.com

Re: [parisc-linux] 735/125 Wide Diff scsi

[John David Anglin]

> Richard Nairn writes...
> 
> > Hi There,
> > 
> > I have a number of Seagate WD drives that I would like to put on my
> > 735/125.  It doesn't seem to recognize them.  Is the Wide scsi chain
> > supported?
> 
> Well if you're plugging it in to a narrow single ended bus the drive should 
> fall back. If you're trying to plug it in to a wide high voltage 
> differential bus that's not going to work.
> 
> So which bus does your 735 have?

They have both SE and WD.  As far as I know, the controller for the WD
bus is still not supported.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: [parisc-linux] 735/125 Wide Diff scsi

[Richard Nairn]

Is there any approx time for the WD driver? I have about 60G I can put on
my machine if it works.. Will it work if It gets plugged in the SE Chain?




On Thu, Oct 24, 2002 at 06:25:12PM -0400, John David Anglin wrote:
> > Richard Nairn writes...
> > 
> > > Hi There,
> > > 
> > > I have a number of Seagate WD drives that I would like to put on my
> > > 735/125.  It doesn't seem to recognize them.  Is the Wide scsi chain
> > > supported?
> > 
> > Well if you're plugging it in to a narrow single ended bus the drive should 
> > fall back. If you're trying to plug it in to a wide high voltage 
> > differential bus that's not going to work.
> > 
> > So which bus does your 735 have?
> 
> They have both SE and WD.  As far as I know, the controller for the WD
> bus is still not supported.
> 
> Dave
> -- 
> J. David Anglin                                  dave.anglin@nrc.ca
> National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)
---end quoted text---

-- 
|       Richard Nairn          Specializing in Linux
|     Nairn Consulting         Web / Database Solutions
|        Calgary, AB           
| Richard@NairnConsulting.ca

Re: [parisc-linux] 735/125 Wide Diff scsi

[John David Anglin]

> > Richard Nairn writes...
> > 
> > > Hi There,
> > > 
> > > I have a number of Seagate WD drives that I would like to put on my
> > > 735/125.  It doesn't seem to recognize them.  Is the Wide scsi chain
> > > supported?
> > 
> > Well if you're plugging it in to a narrow single ended bus the drive should 
> > fall back. If you're trying to plug it in to a wide high voltage 
> > differential bus that's not going to work.

That's not correct.  Seagate WD drives must be installed on the wide
high-voltage differential bus.  They will not work on a SE bus (even
a wide one).  You also need a WD bus terminator.  They are different
from wide SE terminators.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: [parisc-linux] 735/125 Wide Diff scsi

[John David Anglin]

> Is there any approx time for the WD driver? I have about 60G I can put on
> my machine if it works.. Will it work if It gets plugged in the SE Chain?

No.  It may cause damage.

There was a question about the WD driver not too long ago.  You could search
for the answer but I believe only hpux supports the WD interface at this
time.  You may be able to add a newer LVD to the SE chain and have it
work.  I'm not sure if it could be used as a boot device though.

I've been watching for this support for some time as I have a 735 with
a bunch of Seagate WD drives on it running under hpux.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: [parisc-linux] 735/125 Wide Diff scsi

[Grant Grundler]

"John David Anglin" wrote:
> That's not correct.  Seagate WD drives must be installed on the wide
> high-voltage differential bus.  They will not work on a SE bus (even
> a wide one).  You also need a WD bus terminator.  They are different
> from wide SE terminators.

Dave has it right.

HP did sell *narrow* HVD devices for workstations but it's rare
and IIRC only available as EISA add-on cards.

grant

Re: [parisc-linux] 735/125 Wide Diff scsi

[Grant Grundler]

"John David Anglin" wrote:
> > Is there any approx time for the WD driver? I have about 60G I can put on
> > my machine if it works.. Will it work if It gets plugged in the SE Chain?
> 
> No.  It may cause damage.

Not true.
Mixing SE and HVD devices on a SCSI bus will result in the interface
chips "tri-stating". ie no one can talk on the bus. But nothing smokes
either - at least not for the HP product testing I was involved with
several years ago.

> There was a question about the WD driver not too long ago.  You could search
> for the answer but I believe only hpux supports the WD interface at this
> time.

And that's going to get dropped soon too.
Last product to support HVD is based on Sym53c876 chip.
The interface cards are supported on new IA64 machines
but I'm not sure one can purchase them or purchase HVD disks.

> You may be able to add a newer LVD to the SE chain and have it
> work.  I'm not sure if it could be used as a boot device though.

The LVD should work fine as a boot device in SE mode.
LVD devices talk SE like any other SE device (AFAIK).

grant

Re: [parisc-linux] 735/125 Wide Diff scsi

[Derek Engelhaupt]

So my C180 has a different HVD controller chip than the 735?

derek

--- Grant Grundler <grundler@dsl2.external.hp.com> wrote:
> "John David Anglin" wrote:
> > > Is there any approx time for the WD driver? I have about 60G I
> can put on
> > > my machine if it works.. Will it work if It gets plugged in the
> SE Chain?
> > 
> > No.  It may cause damage.
> 
> Not true.
> Mixing SE and HVD devices on a SCSI bus will result in the interface
> chips "tri-stating". ie no one can talk on the bus. But nothing
> smokes
> either - at least not for the HP product testing I was involved with
> several years ago.
> 
> > There was a question about the WD driver not too long ago.  You
> could search
> > for the answer but I believe only hpux supports the WD interface at
> this
> > time.
> 
> And that's going to get dropped soon too.
> Last product to support HVD is based on Sym53c876 chip.
> The interface cards are supported on new IA64 machines
> but I'm not sure one can purchase them or purchase HVD disks.
> 
> > You may be able to add a newer LVD to the SE chain and have it
> > work.  I'm not sure if it could be used as a boot device though.
> 
> The LVD should work fine as a boot device in SE mode.
> LVD devices talk SE like any other SE device (AFAIK).
> 
> grant
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> parisc-linux mailing list
> parisc-linux@lists.parisc-linux.org
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Re: [parisc-linux] 735/125 Wide Diff scsi

[Matthew Wilcox]

On Fri, Oct 25, 2002 at 05:00:14PM -0700, Derek Engelhaupt wrote:
> So my C180 has a different HVD controller chip than the 735?

The problem is that 735's CPU can't allocate consistent memory -- the
C180 has the CCIO IOMMU, so it can.  The ncr53c7xx driver relies on
being able to allocate consistent memory.

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