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 [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
