Date: Fri, 27 Jan 2006 09:55:17 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "Gustavo A. Baratto" <gbaratto@superb.net> Cc: geom@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: gmirror + ggate Message-ID: <20060127085517.GA789@garage.freebsd.pl> In-Reply-To: <01a601c622eb$f5d62970$6450fb40@guinness> References: <013c01c622cb$43256ef0$6450fb40@guinness> <43D97268.2030700@fer.hr> <01a601c622eb$f5d62970$6450fb40@guinness>
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[-- Attachment #1 --] On Thu, Jan 26, 2006 at 06:47:06PM -0800, Gustavo A. Baratto wrote: +> Thanks for the links Ivan... +> +> They answered some of my questions, but mostly they don't really describe what I wanna do, because they mostly refer to more than one client mounting a gmirrored+ggated +> device. I want just one server to mount a gmirrored device, exported from two different boxes through ggated. +> +> Being more specific: +> +> - Servers X and Y will be file server. They will have big sized identical partitions (for example /dev/da0s1f), that will be exported through ggated, and of course not +> mounted on servers X and Y. +> +> - Server A will ggatec the remote /dev/da0s1f devices from both servers X and Y (/dev/ggate0 and /dev/ggate1). +> Then, server A will create the mirror with the devices ggate0 and ggate1: +> # gmirror label -v -b round-robin data ggate0 +> # gmirror insert data ggate1 +> # mount /dev/mirror/data /mnt +> +> Just server A will mount /dev/mirror/data RW (or even RO). There will be a problem when you lost connection to one of the servers - ggate will return EIO (or ENXIO) on every I/O request, so gmirror will mark this component as broken and will remove it from the mirror so it won't be automatically reconnected when the connection come back. I was wondering how to handle this better. I think we can return ENXIO from ggate and just disconnect provider on error != EIO (without marking it as broken). -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFD2d/1ForvXbEpPzQRAn0tAKCBDcwqS9VdjSHdz7CJsp5jnmnx2wCdFRJo jY9qhbtzV0PEg0/P01WR2GI= =7VuA -----END PGP SIGNATURE-----
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