Date: Fri, 18 May 2012 09:34:19 +0800 From: Marcelo Araujo <araujobsdport@gmail.com> To: George Kontostanos <gkontos.mail@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Mirror of Raidz for data reliability Message-ID: <CAOfEmZj9mPnU%2BxgYP8qNWdPL_seqO7vxvwB-ZNOr3dGEUW5dbQ@mail.gmail.com> In-Reply-To: <CA%2BdUSyraV54L_j01gQaWYCsmNJBOt4-j4OayxiiRfMFO4vJLqg@mail.gmail.com> References: <CAOfEmZh8v5xbQqkJJ7ZKkan7Ho0FPNrXJ95S1WRpioDXVG6P7w@mail.gmail.com> <20120515102206.GA53750@psconsult.nl> <CAOfEmZiTkr9Xcj6J4FRBd4FzL1ztgEpytSAUc=wZ8DBJtXsH%2Bg@mail.gmail.com> <CA%2BdUSyrG-RFFjchEYfovbvORVBZNHes9r9MhhGG1d568cO-CwA@mail.gmail.com> <CAOfEmZhtxvNM3kiK5mvTZCxzkTiVWKt97yAudfaxFCnjbANQ0g@mail.gmail.com> <CA%2BdUSyppT%2Bngjn9UXBVW1K0eDa93OB00Rd=TX31brwmAaxNy8w@mail.gmail.com> <CA%2BdUSyraV54L_j01gQaWYCsmNJBOt4-j4OayxiiRfMFO4vJLqg@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
2012/5/17 George Kontostanos <gkontos.mail@gmail.com> > On Thu, May 17, 2012 at 1:52 PM, George Kontostanos > <gkontos.mail@gmail.com> wrote: > > > Ok, after reading more carefully your first post I realized what you > are trying to do. > > 2 Machines, 2 different controllers. Yet interconnected. So, in a way > both machines would be able to see both controllers. > > This is very interesting but there are some implications. > > 1) Suppose you manage to create a mirror consisted by drives on those > different controllers. If you reboot machine #1 machine#2 might panic. > It is not like loosing a drive, here we are loosing a controller. > I don't know, why the machine#2 might panic. However, one controller will be passive and not active. > > 2) Both machines have to be online and the pool has to be mounted > readonly on the standby! You don't want both of them to accidentally > write at the same pool. > > Not no.You can use Devd to start some scripts to mount the FS in another machine or something like that. But I can't be focused only in this scenario, I believe there are much more application for it. > 3) HAST requires tcp to work therefore it is a no go. HAST also works > in the vdev level. Therefore the resources should not be online on the > standby server. > > Good luck, this is certainly very interesting. > Thanks dear George, any input and ideas is always welcome. Best Regards, -- Marcelo Araujo araujo@FreeBSD.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAOfEmZj9mPnU%2BxgYP8qNWdPL_seqO7vxvwB-ZNOr3dGEUW5dbQ>