Date: Tue, 9 Jul 2002 16:37:59 -0600 From: "Kenneth D. Merry" <ken@kdm.org> To: Keith Pitcher <kpitcher@locallink.net> Cc: freebsd-hackers@freebsd.org Subject: Re: [hackers] Multi CDR burn Message-ID: <20020709163758.A75775@panzer.kdm.org> In-Reply-To: <20020709222716.GA21856@stone.locallink.net>; from kpitcher@locallink.net on Tue, Jul 09, 2002 at 06:27:16PM -0400 References: <20020708220105.GA32341@stone.locallink.net> <15658.50186.945164.162061@canoe.velocet.net> <20020709191404.GA97352@stone.locallink.net> <15659.17952.903580.570415@canoe.velocet.net> <20020709161015.A75408@panzer.kdm.org> <20020709222716.GA21856@stone.locallink.net>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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