Indigo 2 Hard drive compatibility

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Toxiccameron
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Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Thu Mar 23, 2017 8:24 pm

So when looking at documentation for SCSI drives I can use, i noticed that I had bought a ultra320 SCSI drive without thinking about pin compatibility. From what I have read apparently it is also safe to use 68 pin drives in the indigo 2 drive from the sgidepot website. Is this true? This is what I bought : https://www.amazon.com/gp/product/B0006437XM/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
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Re: Indigo 2 Hard drive compatibility

Unread postby mia » Thu Mar 23, 2017 8:27 pm

should be fine
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Re: Indigo 2 Hard drive compatibility

Unread postby Trippynet » Fri Mar 24, 2017 10:09 am

Ultra320 drives will work, so long as they respect the necessary fall-back to the SCSI2 bus in the Indigo2 (both drives in my Indigo2 are U320 SCA drives - see my sig). From all the drives I've tested (about 20 different models), I'd say somewhere between 1/2 and 2/3 of them have worked fine. The others don't support the necessary fall-back and so aren't recognised by the Indigo2. Unfortunately for that drive, they only list the IBM part number in the listing, not the original make/model of the drive.

It might work, you'll just have to hope you're lucky.
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Re: Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Fri Mar 24, 2017 6:34 pm

Just got my hard drive and indigo 2. The port on the drive does not match the one in the computer itself. I'm either going to have to get an difrent hard drive and use the boxy looking adapter that came with the computer, or find an adapter for this kind of scsi port and hope it works. I've attached some photos of the drive if that helps.
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Re: Indigo 2 Hard drive compatibility

Unread postby Raion-Fox » Fri Mar 24, 2017 6:41 pm

Use a 68-50 pin adapter.
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Re: Indigo 2 Hard drive compatibility

Unread postby Trippynet » Sat Mar 25, 2017 3:47 am

I'm not aware of it being possible to connect a hard drive directly to the backplane connector in an Indigo2. I know someone looked into it a bit back, but I don't recall them having any success.

Raion-Fox is correct, you need to use the hard drive tray with a 50->80 adapter. The adapters aren't expensive. Quick word of warning though, once you've got the connector attached, you'll notice it's a tight fit with the drive screwed in. Pop a layer of cardboard between the adapter and the back of the drive, otherwise the pins on the back of the connector can touch the metal case of the hard drive and short out.
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Re: Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Thu Apr 20, 2017 10:09 pm

Alright I'm back. I got my video all worked out and in hinv my drive is not shown. I hope it's just that the drive isn't working. In that case can someone point me to a known working drive? Post doesn't say any errors and hinv doesn't give me a drive so I'm assuming it's the drive itself.
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Re: Indigo 2 Hard drive compatibility

Unread postby Raion-Fox » Thu Apr 20, 2017 10:18 pm

Old 50 pin drives work, but they're old, slow, noisy and spensive
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Re: Indigo 2 Hard drive compatibility

Unread postby jan-jaap » Fri Apr 21, 2017 12:12 am

Raion-Fox wrote:Use a 68-50 pin adapter.

Except we're looking at a SCA disk, not UW (68pins). What's needed is a SCA-to-50pin adapter. Something like THIS.

HERE you can see such an adapter in action. You do have a disk sled, I hope? Otherwise you will need to get one one. You set the SCSI ID of the disk with jumpers on the adapter. The system disk of an SGI normally has device ID #1.

They used to be $1,50 last time I bought a dozen or so of them, but that was 10 years ago ...
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Re: Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Fri Apr 21, 2017 7:02 am

jan-jaap wrote:
Raion-Fox wrote:Use a 68-50 pin adapter.

Except we're looking at a SCA disk, not UW (68pins). What's needed is a SCA-to-50pin adapter. Something like THIS.

HERE you can see such an adapter in action. You do have a disk sled, I hope? Otherwise you will need to get one one. You set the SCSI ID of the disk with jumpers on the adapter. The system disk of an SGI normally has device ID #1.

They used to be $1,50 last time I bought a dozen or so of them, but that was 10 years ago ...


I do have an adapter that takes the sca hard drive and the cable link to the port on the sled. How should the id be assigned? In just used the little cable on the sled adapter and but the two pins that stick out to the id selectors. Is that meant for the hard drive activity lights?
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Re: Indigo 2 Hard drive compatibility

Unread postby jan-jaap » Fri Apr 21, 2017 2:11 pm

Toxiccameron wrote:How should the id be assigned?

On the SCA-to-50pin adapter PCB there's a row of a dozen or so jumpers. Look for the jumpers marked ID0, ID1 and ID2. These can be used to assign a SCSI ID between 0 and 7 in binary. Installing a jumper on ID0 and leaving ID1 and ID2 open sets SCSI ID to '1'.
Toxiccameron wrote:In just used the little cable on the sled adapter and but the two pins that stick out to the id selectors. Is that meant for the hard drive activity lights?

No, the original disk that the system came with had a bunch of jumpers as well, and placing this plug on the jumper block would 'magically' set the SCSI ID depending on the position of the sled in the system. Not a very flexible system because jumpers on harddisks are absolutely not standardized, even if you limit yourself to a single vendor. This plug is best ignored.

But I have the feeling you do not have a SCA-to-50pin adapter at all. This adapter is installed on the SCA connector of the disk, and then the cable from the disk sled is plugged into the adapter. The connector that mates the sled to the Indigo2 vaguely looks like SCA but is entirely unrelated.
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Re: Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Fri Apr 21, 2017 4:26 pm

jan-jaap wrote:
Toxiccameron wrote:How should the id be assigned?

On the SCA-to-50pin adapter PCB there's a row of a dozen or so jumpers. Look for the jumpers marked ID0, ID1 and ID2. These can be used to assign a SCSI ID between 0 and 7 in binary. Installing a jumper on ID0 and leaving ID1 and ID2 open sets SCSI ID to '1'.
Toxiccameron wrote:In just used the little cable on the sled adapter and but the two pins that stick out to the id selectors. Is that meant for the hard drive activity lights?

No, the original disk that the system came with had a bunch of jumpers as well, and placing this plug on the jumper block would 'magically' set the SCSI ID depending on the position of the sled in the system. Not a very flexible system because jumpers on harddisks are absolutely not standardized, even if you limit yourself to a single vendor. This plug is best ignored.

But I have the feeling you do not have a SCA-to-50pin adapter at all. This adapter is installed on the SCA connector of the disk, and then the cable from the disk sled is plugged into the adapter. The connector that mates the sled to the Indigo2 vaguely looks like SCA but is entirely unrelated.


I have attached a picture of my adapter along with the jumper config. I did some reading and apparently drives like this set pins by software, but I assume it can also be done with jumpers. Is there a special jumper setup or is my adapter just not going to work? The hard drive I am using is an IBM maw3147nc.
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Re: Indigo 2 Hard drive compatibility

Unread postby japes » Fri Apr 21, 2017 7:18 pm

If you're lucky you can land that connector on the id0-id2 pins on that adapter board. Then if you plug the drive in the lower slot it would be id 1 and the upper slot would set the drive to id 2. Or it won't work correctly and you'll end up on id 7 or reversed or some odd thing. You could move the wires around in the connector, but really just set it and forget it.

On SCA drives the id pins are in the 80-pin connector instead of (or sometimes in addition to) the pins on a jumper block on the drive.

Best bet is to just get a jumper on the ID0 pair on that adapter. Looks like you have a jumper on ID1, that would set the id to 2, so move that jumper down a space to ID0.
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Re: Indigo 2 Hard drive compatibility

Unread postby japes » Fri Apr 21, 2017 7:23 pm

I guess, one more thing - you should have seen the drive show up in your hinv, but as id 2. Check that the drive is plugged in and maybe you can hear it spin up. Like mentioned above by Trippynet, be sure the board isn't pushed into the back of the drive and shorting out. I usually wrap the back of the adapter board with some electrical tape or you can shove some thick cardstock or cardboard in between the drive and the adapter.
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Re: Indigo 2 Hard drive compatibility

Unread postby Toxiccameron » Fri Apr 21, 2017 7:39 pm

japes wrote:I guess, one more thing - you should have seen the drive show up in your hinv, but as id 2. Check that the drive is plugged in and maybe you can hear it spin up. Like mentioned above by Trippynet, be sure the board isn't pushed into the back of the drive and shorting out. I usually wrap the back of the adapter board with some electrical tape or you can shove some thick cardstock or cardboard in between the drive and the adapter.


The drive does not show up in any hinv but my CD Rom does. The drive audibly spins up but despite having changed the id on the adapter, making sure it isn't shorting and switching slots, nothing has worked. I don't think the adapter can die but the drive could have been harmed in some way. But on boot up I hear it spin up and do some sort of disk activity or at the very least move the head in some way. I don't have another system to test the drive on and don't have a pc adapter anyway.
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