Hi,
> So, what types of failures will RAID successfully overcome?
I think any failure that will lead to a definite error result of the
SCSI driver level will be OK with SW-RAID.
The problem is, that some the SCSI driver might try to recover by doing bus
resets for quite some time (if made dumb, maybe forever bus-resetting 8( ).
Or there might be some "hanging", if there are no timeouts in the driver.
Both should be fixable in the source of the scsi driver if that happens.
Another problem with multiple devices (as normal) on a bus is that there
might be a hardware problem on the bus (bus blocking by defective bus
interface). SW-RAID and SCSI-driver can´t do anything in such a case.
But I think this doesn´t happen as often as media defects and head crashes
(and these shouldn´t affect the bus interface).
> Oh, BTW, the system has dual channel SCSI (Adaptec AIC-7xxx)
Onboard ? Which board / which controller exactly ?
> on each channel. Thus when I unplugged the SCSI cable it only affected that
> one channel. And, since we're using Ultra SCSI II (or whatever the proper
> term is)
Maybe you mean U2W/LVD.
> the cable is actively terminated with a circuit board on its end so
> I don't think it is a termination issue.
Right.
Thomas
