In message <Pine.NEB.4.44.0209031046530.370-100000@moss.emlyn.cowbeastie.com> you write:

|> 	Have people seen the tagged queing problem on other sparc
|> 	machines, or just the IPC?

Well I _had_ a problem with an IBM DNES-318350 drive that wouldn't work
with _any_ OS _other_than_ OpenBSD-2.3. There should be some messages in
this list's archive. From <200112191010.fBJAACS28505@Iapetos.teknon.de>:

|> In message <20011217132013.A21657@WintelKiller.T> I write:
|> 
|> |> sd1(esp1:1:0): esp1: timed out [ecp 0xf03d68d0 (flags 0x3, dleft bc00, stat 0)], <state 1, nexus 0x0, phase(l 0, c 100, p 7), resid bc00, msg(q 0, o 0) >
|> 
|> Set up a spare Sparc-2 to run NetBSD-1.5.1 diskless, connected DNES to
|> on-board controller, and got:
|> 
|> sd0(esp:0:1:0): esp0: timed out [ecp 0xf03ac0d0 (flags 0x3, dleft d200, stat 0)], <state 1, nexus 0x0, phase(l 0, c 100, p 7), resid d200, msg(q 0, o 0) >
|> 
|> |> Next thing is to reconnect the DNES to the OpenBSD box.
|> 
|> Works. I can newfs, then dump | restore some stuff, fsck, it works.
|> This is using the same cable, terminator, and power outlet where it
|> didn't work five minutes before connected to the NetBSD box.

I have never gone into that problem any more after I got a Seagate
ST318416N that worked out of the box.