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Old 21 April 2013, 22:31   #1
tesla
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scsi luns

Ok, I was just reading about scsi and address and luns.

I understand address's, and how to change them, you have to terminate the last device, etc.

But luns, I don't understand.

I'm beginning to wonder if because my scsi HDD has a lun of 0, and so does my scsi cd drive, that that fact might be causing my problems.

It seems that my installation of 3.1 is working well, but if I try to access the cd drive, and I go into a folder or directory, my system locks up, and guru's. After guru'ing, it then resets itself

This is what the GURU message report shows:

8000 0003
Task 0884 5078

One time, the 0003 was a 0006
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Old 21 April 2013, 23:29   #2
emufan
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a good thread about that issue. some quotes:

Quote:
The ID is set by jumpers on the back of the device.
The LUN is set by the device internally and cannot be changed. (Except perhaps by a firmware update)

In case of the multi-reader the LUN corresponds to the slot. The SCSI ID is equal for all slots. The combination of LUN and ID determines the Unit.
Quote:
LUNs being MSB and SCSI ID as LSB
( of the UNIT in mountlist )
Quote:
SCSI ID 2 becomes Unit 2, not Unit 20.

Unit = 2 means ID = 2, LUN = 0
Unit = 20 means ID = 0, LUN = 2

Last edited by prowler; 21 April 2013 at 23:36. Reason: Changed link from opening post to thread.
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Old 21 April 2013, 23:38   #3
prowler
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Nice find, emufan.

I searched for that thread but didn't find it.

BTW, I changed the link in your post above to point to the thread rather than the opening post.
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