I had this problem from 0.97pl1, and now pl2, when SCSI is accessed, the
system seems stop to respond to other vc, and SCSI itself is SLOW. sometimes
the hard drive LED light but nothing happened, when this happened, I usually
can issue some command on other vc and the "deadlock" on SCSI seemed resolved.
the system is:
33 MHZ 486 with AHA1542B Maxter 8760S, the files systems are sda3 32MB swap 
(I don't know I need it since I have 16MB memary), sda4 64MB minix, sda5 100MB
on logical device, sda5 200MB also a logical device. sda[56] are extended files
systems. I guess the problems may be that I use extended file systems on 
extended partition on a SCSI drive? can I repartition the system that not use
the extended partition solve the problem? The other partitions are used for
OS/2, so the system must coexist with OS/2.

Thanks.

-- Youda