Indigo Fresh Install Problems

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ScutBoy
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Re: Indigo Fresh Install Problems

Unread postby ScutBoy » Fri Oct 27, 2017 5:44 am

robespierre wrote:The jumpers to set the block size on the XM-xxxx drives are pads on the circuit board that you can cut with an X-Acto knife. You normally cut the outermost pad (see http://rainbow.ldeo.columbia.edu/docume ... re/40.html).


Yes - this. I have at least one Toshiba drive where I had to do this to work with old Suns. I have it in a marked enclosure so I a) can find it and b) don't accidentally toss/lend it to someone.

I also concur that shorter SCSI cable is better.
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Daniel80486
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Re: Indigo Fresh Install Problems

Unread postby Daniel80486 » Fri Oct 27, 2017 7:45 am

pentium wrote:A six foot scsi cable?? :shock:


I'm probably wrong... it seems longer than 3 feet and I took a guess. :?
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josehill
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Re: Indigo Fresh Install Problems

Unread postby josehill » Fri Oct 27, 2017 8:23 am

pentium wrote:A six foot scsi cable?? :shock:


Due to a particularly challenging data center space issue, I once had a RAID unit sitting 40 feet away from a Power Challenge. I had 50 foot SCSI cables custom made to resolve the situation. They were extremely well made, almost an inch thick, and they worked great! (The SCSI busses were high voltage differential SCSI, which, according to the HVD SCSI spec, supported maximum lengths of 75 feet, IIRC.)

...but yeah, with standard, low voltage, single-ended SCSI, I always tried hard to keep individual cables short (12 inches or less) and fat (well insulated) and to stay well under a six foot total run length.

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Re: Indigo Fresh Install Problems

Unread postby Baphijmm » Mon Dec 25, 2017 11:12 pm

robespierre wrote:6 feet is about the limit for single-ended 10 MHz SCSI. The CDROM drive will probably negotiate at 5 MHz, though, so it should be okay. I agree that shorter lengths are more reliable (the long cables like 6 or 10 feet are mainly designed for differential systems, which can be much longer because of their common mode noise rejection).

The jumpers to set the block size on the XM-xxxx drives are pads on the circuit board that you can cut with an X-Acto knife. You normally cut the outermost pad (see http://rainbow.ldeo.columbia.edu/docume ... re/40.html).


I'm certainly glad someone mentioned this; I would have had no idea to even begin to look for solder pads I'd have to cut.

Unfortunately, we're still at the same problem. Exact same issue as this drive has had from my starting to use it. I've cut both pads, just to be sure (re-soldered the first after it didn't work, which was the innermost but labeled "1" unlike that document describes), but the silly thing seems to be acting as though the parity size is still wrong.

Since it was asked: The drive is being connected from an external enclosure using a 5-foot C-50 cable to the Indigo, and a known-working terminator on the other connector on the external enclosure. I do not know the manufacturers, but these items have worked in tandem on other systems without any issues.
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