To: tru64-unix-managers
My original question is below:
> We just took delivery on a DS20 system, but the disk configuration from
the
> factory seems a bit odd and not exactly what we wanted. 7 of the 8 drives
> in the system are connected to the internal SCSI controller (KZPCM-DA?),
> all in the internal shelf.
> We also bought two single-channel RAID
> controllers (KZPAC-AA) that we'd like to use for hardware RAID. The 8th
> drive, in an external shelf, was conneced to one of the KZPACs by our
FSE.
> What I think I'd like to see is:
> a. 4 drives in internal shelf connected to one KZPAC
> b. 4 drives in external shelf connected to the other KZPAC.
> c. hardware stripe within shelves, software mirror w/LSM across shelves.
> Anyone see any problems with doing this? I'm particularly interested if
> using the KZPACs would cause some performance penalty vs. the other
> controllers.
Thanks to:
alan_at_nabeth.cxo.dec.com
Neils Roetert <Neils.Roetert_at_pqr.nl>
"Andrew C. Stoffel" <acs_at_campus.com>
The short answer is: you *can* get there from here. Using the KZPACs does
make sense for all the disks in the system. We will use hardware stripesets
and software mirroring with LSM (though both Neils and Andy pointed out
that using a 3-channel controller would have allowed hardware RAID
0/1--this is an important point for future system purchases).
Alan pointed out the merits of separating the OS from data when creating
the RAIDsets, and we will set the system up accordingly.
Thanks again.
--Russ
----------
Russell C. Fish IDX Systems Corp.
Oracle DBA/Unix System Admin 1001 4th Ave. Suite 1500
PH: 206-689-1302 Seattle, WA 98154
mailto:russ_fish_at_idx.com
Received on Wed Sep 01 1999 - 14:46:40 NZST