[rescue] Sun E4500 SCSI weirdness

r.stricklin bear at typewritten.org
Sun Jun 6 13:23:05 CDT 2010

I believe I recall something about cable length - that because the  
first IO board drives the removable media bays, it cannot be used for  
anything else.


Sent from my iPhone

On Jun 6, 2010, at 2:14 PM, Mr Ian Primus <ian_primus at yahoo.com> wrote:

> I've been having intermittent issues with the onboard SCSI on my Sun  
> Enterprise 4500. It's the ESP SCSI on the I/O board. The internal  
> DVD drive always works fine, but it's picky about what drives it'll  
> work with connected to the external port. I've tried various  
> combinations of drives and cables, and some drives just won't show  
> up - or generate errors like "Unexpected in 1". One drive, a Seagate  
> 18 gig, I have been using as my boot drive. It has Linux loaded on  
> it. When I do a probe-scsi from the monitor, it prints Drive 0, then  
> clears the screen, then continues with the ID string from the drive.  
> It seems to hate HP branded drives, and simply ignores them.
> Sometimes, this port generates I/O errors within Linux - which  
> results in the root partition going offline, which causes all sorts  
> of bad things to happen.
> I've swapped over to using the SCSI port on the PCI I/O board. This  
> one seems to work properly, no I/O errors thusfar. Also, drives  
> correctly identify using probe-scsi-all.
> I'm only trying to use one device (and the internal DVD, of course).  
> I'm using a Sun 611 drive enclosure. I've tried different cables,  
> different enclosures, different drives, using a terminator, not  
> using a terminator (The 611 is self-terminating), etc.
> The thing is, that I've even swapped the main I/O board with a  
> spare, and still have the same problems. It shouldn't be HV  
> differential, because it has the SE SCSI logo on it.
> Any ideas?
> -Ian
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