Hi -
A bit of a hardware technical question - perhaps someone on the
list knows the answer.
We have an SW800 RAID box with dual HSZ40-B controllers currently
connected to an 8400. The controllers are set up in the dual
redundant configuration.
We have another group that is thinking about hooking up to the
SW800 - buying drives to fill the open slots and running RAIDs over
those drives. Because of this, I started to look over the HSZ40's to
figure out how a second host can hook up to them.
I was under the impression from the sales people that the system
we bought was both dual ported and dual redundant. After the first
look at the HSZ40's, I couldn't understand how this is possible. I
just spent the past hour or so going through all of the documentation
for the system and found nothing to explain how to do this. In order
to hook the controllers to two systems, wouldn't each controller have
to have two SCSI busses?
It looks to me that if you want to hook the system up to two host
computers, you have to remove the link between the controllers in
order to terminate the busses - thus loosing the redundancy feature.
Have I missed something?
A second question - if you do remove the link and hook each
controller it's own host, how do you prevent the two hosts from
mounting the same RAID sets. If they do mount the same RAID sets, how
do you prevent the two hosts from interfering with each other if they
try to write to the same place at the same time? How do the
write-back caches on the HSZ40's come into play? (i.e. Assuming you
can do this, how do the HSZ40's insure cache coherency?)
thanks
-dave
Received on Sun May 05 1996 - 03:46:18 NZST