Yo Paul!
SCA2 drives (i.e. SCSI with that odd connector) have pins of
different lenghts. This allows sequencing of ground, power and
signal while hot-swapping drives.
Some brands of drive carriers also have this feature.
RGDS
GARY
On Tue, 8 Jun 1999, Paul Jakma wrote:
> 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
> -------------------------------------------
> Fortune:
> Whenever I hear anyone arguing for slavery, I feel a strong impulse to
> see it tried on him personally.
> -- Abraham Lincoln
>
>
>
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 20340 Empire Ave, Suite E-3, Bend, OR 97701
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