On Tue, Jul 09, 2002 at 18:27:16 -0400, Keith Pitcher wrote:
> > > I also didn't know that there was a write-to-many SCSI command?
> > > Someone can confirm or deny this
>
> Coulda sworn the raid controller on our main freebsd machine does mirroring
> via scsi with a single command. So I took it that this was a scsi card ability
> and not a raid controller option.
You send a single command to the RAID controller, but it will send a
command to each disk in the mirror on a write.
> I did a real quick search of the scsi spec and came across the
> "Single Initiator - Multiple Targets" ability but this may
> not mean what I take it to mean.
It doesn't mean you can talk to multiple targets simultaneously. Just that
with one SCSI initiator, you can talk to multiple targets one at a time.
With SAS (Serial Attached SCSI) that may change, since SAS is inherently a
point to point protocol.
Ken
--
Kenneth Merry
ken@kdm.org
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