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тАО12-07-2008 03:28 AM
тАО12-07-2008 03:28 AM
Is this a know problem?
Any remedy except having a extra SCSI interface dedicated to the tape?
Solved! Go to Solution.
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тАО12-07-2008 06:25 AM
тАО12-07-2008 06:25 AM
Re: HP DAT72 and disks on same bus on a PWS
are all these devices? Internal? External?
With single-ended SCSI, it's difficult to
have both on one adapter without exceeding
the maximum cable length (which can be
remarkably short).
On my main XP1000, internally I have two hard
disks and a DVD-ROM drive on the on-board
SCSI, and externally, a tape (DLT), a hard
disk, and a CD-R/RW drive on a KZPBA-CX card
(which has nothing connected internally).
You may not need a SCSI card dedicated to the
tape, but you may need one (or more) cards
dedicated to external devices.
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тАО12-07-2008 07:49 AM
тАО12-07-2008 07:49 AM
Re: HP DAT72 and disks on same bus on a PWS
Right now I have it connected to an extra scsi card, and it works. The only painful thing is the PCI scsi external connector, that is useless since if I connect anything to it, the tape stops working and the connected device is never detected if I do. So I will have to tape it over with red tape.
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тАО12-07-2008 09:13 AM
тАО12-07-2008 09:13 AM
Re: HP DAT72 and disks on same bus on a PWS
The HP DAT72 is a LVD/SE device, the specs says.
What kind of bus do we have in a PWS500? HVD or LVD?
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тАО12-07-2008 11:24 AM
тАО12-07-2008 11:24 AM
Re: HP DAT72 and disks on same bus on a PWS
40cm should be short enough. A Web search
for keywords like "scsi cable length" should
find some opinions/facts. External cables
tend to be longer than they look because of
the cable hidden inside drive enclosures.
> [...] with and without termination [...]
Where is "with"? Some devices have built-in
terminators which may need to be disabled.
You should have only one terminator at each
("terminal") end of the cable.
> What kind of bus do we have in a PWS500?
> HVD or LVD?
SE, normally. LVD devices should be able to
adapt to single-ended environment, however.
(Most of my hard disks are LVD/SE, for
example.)
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тАО12-07-2008 11:48 AM
тАО12-07-2008 11:48 AM
Re: HP DAT72 and disks on same bus on a PWS
This sounds to me, almost certainly a termination issue. As Steven suggested, you may have something double terminated, especially if you're trying to use, both internal and external connectors of a SCSI card.
Cheers,
Rob
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тАО12-07-2008 12:17 PM
тАО12-07-2008 12:17 PM
Re: HP DAT72 and disks on same bus on a PWS
Now, I got some success.
I saw on the HD that there was a strap "force single-ended mode". I put a strap on it and then it actually seemed to work. However it has been working now and then before, so time will tell.
Seems like mixing old and new devices may cause problems.
Again, what mode is most probably used by the QLogic and on-board controllers in a PWS500?
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тАО12-07-2008 12:19 PM
тАО12-07-2008 12:19 PM
Re: HP DAT72 and disks on same bus on a PWS
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тАО12-08-2008 08:55 AM
тАО12-08-2008 08:55 AM
Re: HP DAT72 and disks on same bus on a PWS
So the disks were operable but not the tape.
I tired both with a terminated cable and an unterminated, same result.
BTW: What does the strap "Term power" mean?
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тАО12-08-2008 09:27 AM
тАО12-08-2008 09:27 AM
Re: HP DAT72 and disks on same bus on a PWS
Power for the terminator resistors (et c.,
depending on how fancy the terminator is).
Someone on the bus must supply it, but one
source is enough. (It's normally safe to
have more than one source. They're designed
to coexist with others.)