On Tue, 8 Jun 1999, David Robinson wrote:
To my knowledge hot swap drives are no different from normal
drives except you can pause the SCSI bus before pulling them
out/in.
Never heard of being able to pause the scsi bus, sorry. from what
i can tell, the only difference between normal drives and hot-swaps
is mechanical so as to reduce stress on the bus during
mating/unmating.
One problem with Software RAID is that most of us have the two
drives (In the case of a mirror system) on the same SCSI bus.
This causes problems with the card trying to contact a dead drive
and doing a SCSI- Reset will reset the whole SCSI bus and stop
the working drive from talking to the Host. If the driver goes
silly and sends many SCSI resets down the SCSI bus your machine
will lockup as the RAID driver won't be able to talk to the other
working drive. This happened to me in a test of my mirror. It
only happened a few times.. There was nothing I could do about it
as the only spare SCSI bus I had was much slower then the one the
drive was on:-(
i think this more a flaw in linux's scsi error handling. it's not
very clever about it. And trying to access a dead device can hang
linux. The BusLogic driver itself seems to do a good job with
error handling.
regards,
--
Paul Jakma
[EMAIL PROTECTED] http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
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