esp0 errors with multiple cd's

2007-12-25 8:37:00

Problem restated:

> Platform: 4/20 - SPARCstation SLC

> System Config: 16 MB memory

> SunOS 4.1.2

> Sun 0669 External Disk (addr sd0)

> Problem:

> I am trying to add multiple CD-ROM units to this system. The

> CD-ROM unit (Sony) consists of 2 drives in one chassis. I can

> add the first unit without any problem (sr0 at target 6 and sr1 at

> target 5), however when I add the second unit (sr2 at target 1 and

> sr3 at target 2) I get SCSI transport failures (from /var/adm/messages):

> Nov 9 15:47:19 napali vmunix: sd0: SCSI transport failed: reason 'data_ovr': retrying command

> Nov 9 15:47:19 napali vmunix: esp0: data transfer overrun

> Nov 9 15:47:19 napali vmunix: State=DATA Last State=DATA_DONE

> Nov 9 15:47:19 napali vmunix: Latched stat=0x10<XZERO> intr=0x10<BUS> fifo 0x0

> Nov 9 15:47:19 napali vmunix: last msg out: <unknown msg 0xff>; last msg in: COMMAND COMPLETE

> Can someone please enlighten me on what the system is telling me? I would think

> the system could support more than 2 CD-ROM devices so I think this must be

> telling me something about a problem with the devices on the bus.

> Any suggestions?

Many thanks to those who responded. Many reminded me about reconfiguring

the kernel - good advice but I've been at this a while and that is not something

I'd miss. louis@andataco.com (Dances on keyboards) reminded me to go back

to basics and that is what I did. I made sure the external cables were good,

tested each of the units(varying the addresses on each unit) separately, and

finally ended up having to put the unit with SCSI addrs 1 & 2 before addr 5 & 6.

This still wouldn't work quite right until I removed the terminator from the

2nd unit.

Again thanks to all you who responded:

louis@andataco.com (Dances on keyboards)

--eddy

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