Date: Sat, 5 Nov 2005 14:40:29 -0800 From: "Gayn Winters" <gayn.winters@bristolsystems.com> To: "'Ted Mittelstaedt'" <tedm@toybox.placo.com>, "'Steve Bertrand'" <iaccounts@ibctech.ca>, <freebsd-questions@freebsd.org> Subject: RE: gmirror on 1 or 2 IDE cables Message-ID: <011f01c5e259$f2002670$c901a8c0@workdog> In-Reply-To: <LOBBIFDAGNMAMLGJJCKNEELIFCAA.tedm@toybox.placo.com>
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> -----Original Message----- > From: Ted Mittelstaedt [mailto:tedm@toybox.placo.com] > Sent: Friday, November 04, 2005 1:26 PM > To: Steve Bertrand; gayn.winters@bristolsystems.com; > freebsd-questions@freebsd.org > Subject: RE: gmirror on 1 or 2 IDE cables > > > >-----Original Message----- > >From: owner-freebsd-questions@freebsd.org > >[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of > Steve Bertrand > >Sent: Thursday, November 03, 2005 7:28 AM > >To: gayn.winters@bristolsystems.com; freebsd-questions@freebsd.org > >Subject: RE: gmirror on 1 or 2 IDE cables > > > > > > > >> Using gmirror to mirror two identical drives, how much of a > >> performance hit is it to have > >> > >> 1. Both drives on one IDE cable? > >> Compared to: > >> 2. One drive primary on one cable and one secondary on the > >> other cable? > >> Compared to: > >> 3. Both drives primary but on separate IDE cables? > > > >My understanding that only a single drive on each IDE channel can be > >accessed at any one time. > > > > Which may or may not matter depending on what he's doing. Are we > talking mainly reads or writes here? > > Ted > I was mostly thinking about writes; however, now that you raise the issue, can gmirror interleave reads from the two mirrored disks? -gayn
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