Date: Tue, 13 Oct 2009 01:29:20 +0100 From: Daniel Bye <freebsd-questions@slightlystrange.org> To: freebsd-questions@freebsd.org Subject: Re: gmirror, gjournal and glabel - which order? Message-ID: <20091013002919.GB12688@torus.slightlystrange.org> In-Reply-To: <4AD3A8EE.8020708@otenet.gr> References: <20091012211339.GA12688@torus.slightlystrange.org> <4AD3A8EE.8020708@otenet.gr>
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--XF85m9dhOBO43t/C Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Oct 13, 2009 at 01:08:46AM +0300, Manolis Kiagias wrote: > Daniel Bye wrote: > > Hi all, > > > > I'm having a hard time trying to work out which order I should set up > > gmirror, glabel and gjournal on a new system. I want to journal my > > /home partition, label all the partitions for ease of reference, and > > use gmirror to save me in the event a disk goes bad. I am struggling > > to fit the pieces together conceptually in my mind. I understand the > > processes involved in setting each part separately - my problem is in > > trying to build this up in the right order so that it all makes sense. > > > > So far, I have labelled the primary drive and set up the journal. I have > > edited fstab to reflect the labels and journalled file system on /home. > > If I now build a mirror, don't I need to alter fstab to mount that and > > not the stuff in /dev/label? In which case, I guess I need to build the > > mirror first, and then set up labels and journals? > > > > I'm going round and round in circles here and none of the stuff I've > > read on the web enlightens me... :-/ > > > > Any insights or suggestions would be taken as a great kindness! > > > > Dan > > > > =20 > When not mirroring, I first create the journals and then label the > resulting adxxxx.journal devices > In case you are doing a gmirror device, you would not really need the > separate label step - the gm device name won't change and gmirror is not > affected if the device names of the individual disks change (the disks > are marked as part of a mirror and scanned at startup). > When you are creating the composite gmirror device you are effectively > labeling it anyway i.e. gmirror label gm0... > Now if you follow the usual tutorials found in the web you would be > using gm0 / gm1 but you actually name it any way you wish. > If you really need to label the separate gmirrored partitions, do it > after setting up the mirror. >=20 > Concerning the order of journals and mirroring, I create the journals > first, then mirror the result. This has always worked fine for me. Thanks much, Manoli. After posting, I came to more or less the same conclusion, but it's good to get confirmation from someone who clearly knows more about this stuff than I do! I'd still be interested to hear what others think/do. As ever, thanks for your time. Dan --=20 Daniel Bye _ ASCII ribbon campaign ( ) - against HTML, vCards and X - proprietary attachments in e-mail / \ --XF85m9dhOBO43t/C Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (FreeBSD) iEYEARECAAYFAkrTyd8ACgkQixf5fBYiFmpd8ACgqhSJZL4dB2fh/Cdzl4n2iyAB Qr0An1KtduOYMCAim+XLkU3YuBXqsKfg =4ZEA -----END PGP SIGNATURE----- --XF85m9dhOBO43t/C--
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