Hello,

After many months of testing things when I've had spare time, I can now 
say definitively that Quadra class machines (605, 650, 800) will 
eventually lock up under heavy SCSI usage. This does not happen under 
NetBSD 1.6.x.

I've tried several different kinds of SCSI drives, with and without 
command queueing, syncronous and asyncronous, the same drives with 1.6 and 
3, and I have two long term test machines which have significant uptime 
with 1.6.x and can be locked up by cvs'ing src and pkgsrc at the same 
time.

It's hard to believe that there are so few people out there that who 
either never thrash their disks or who don't observe the same lockups. Or 
perhaps they think they're isolated or something. Not sure, but it's 
definitely repeatable, and I've tried four different machines with as many 
different hard drives now.

Ideas, anyone?

John