DSSI disks
Alan's Home for Wayward Notes File.
alan at shodha.enet.dec.com
Fri Jun 14 10:30:33 AEST 1991
In article <1991Jun13.200046.4932 at mlb.semi.harris.com>, jdr at sloth.mlb.semi.harris.com (Jim Ray) writes:
> Anyone know if the DSSI disks are SCSI ( or some form thereof )?
DSSI is not SCSI, though at times it looks a lot like it. First
the storage protocols used are MSCP for disks and TMSCP for tapes.
As with SCSI each "device" on it has an imbedded disk or tape
controller. The DSSI devices are called Integrate Storage Elements
(ISEs).
One way of looking at is that each ISE is a single drive HSC and
the DSSI is the CI.
>
> If not, what type of interface do they use?
Yet another DEC proprietary DSA thing. I suspect that people
that designed looked at SCSI and decided they could do better.
They probably use EDC/ECC instead of parity for data integrity
on the bus. They may have extended the 6 meter cable limit or
least made sure that all 6 meters is usable.
If DSSI drives were closer to SCSI drives in price, I'd prefer
them for storing my files.
>
> Thanks,
You're welcome.
> --
> Jim Ray Harris Semiconductor
--
Alan Rollow alan at nabeth.cxn.dec.com
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