On Sat, 24 Apr 1999, Andy Poling wrote:
> > I agree completely with the first statement. But the second sounds
> > somewhat odd to me. I can hotadd or hotremove a disk on linux with sw RAID
> > and a non-hot swappable capable controller, maybe this is another feature
> > of sw RAID over hw RAID?
>
> Because you're _supposed_ to quiet the SCSI bus while you'ure swapping your
> disk to prevent errors in active requests when you're removing or inserting
> a device into the bus.
we could as well provide kernel functionality to turn a particular SCSI
bus (from within the kernel) off/on by delaying IO requests. This has to
be done carefully to avoid deadlocks (what if the code to turn the bus on
lies on a disk on that bus :), but can be done i think, without hardware
assistance.
-- mingo
