The obvious first two questions are, (i) Have you checked all the cables; and (b) Were any patches recently applied to the system or devices? Probably worth checking the contents of the mt executable against the same executable on other systems, since the kernel doesn't seem to be logging any actual errors.

How about trussing mt and looking at the return status of the tape ioctls? You might work out more of what's going on by checking the man pages and/or .h files for the meaning of a return which mt only interprets as a generic error I/O error.

On Wednesday, January 15, 2003, at 02:48 PM, Dave Belfer-Shevett wrote:


We have a pair of Overland AIT-2 tape changers installed on an Ultra-160.
We were using 'rmt' and ufsdump to dump data to individual tapes on the
drive, and using 'mtx' to change tapes as we moved along.

Problem is, we're getting nothing but I/O errors from the drives now.
Here's what happens if I do an 'mt -f /dev/rmt/1 status':

Jan 15 14:29:19 tub.ma.intuit.com scsi: [ID 193665 kern.info] sgen54 at
glm3: target 6 lun 0
Jan 15 14:29:19 tub.ma.intuit.com genunix: [ID 936769 kern.info] sgen54 is
/pci@1f,2000/IntraServer-Ultra160,scsi@1,1/sgen@6,0
Jan 15 14:30:12 tub.ma.intuit.com scsi: [ID 365881 kern.info]
/pci@1f,2000/IntraServer-Ultra160,scsi@1,1/st@4,0 (st25):
Jan 15 14:30:12 tub.ma.intuit.com <Vendor 'SONY ' Product
'SDX-700C '>
Jan 15 14:30:12 tub.ma.intuit.com scsi: [ID 193665 kern.info] st25 at
glm3: target 4 lun 0

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