Date: Wed, 1 Oct 2008 08:41:18 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Andrew Falanga <af300wsm@gmail.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Setting up gmirror Message-ID: <20081001083751.M7317@wojtek.tensor.gdynia.pl> In-Reply-To: <340a29540809302134p2414e3cfw6a0694026e57d879@mail.gmail.com> References: <340a29540809302134p2414e3cfw6a0694026e57d879@mail.gmail.com>
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> Hi, > > I've just finished setting up a new web server, and if I get my DNS > stuff correct hopefully an e-mail server too, for my church. > Originally, the intention was to use RAID1 on the MOBO. However, the do not ever use "hardware" RAID0/1/10 on motherboard. first it's not hardware, it's purely software, second there is nothing to be accelerated by hardware on RAID0/1/10. use gmirror/gstripe/gconcat everywhere. > make any mention of gmirror(8). It seems like gmirror is rather easy gmirror is easy to set up and works excellent. > Identical drive models so their sizes are the same. Is this the > command, from gmirror(8), the one I'll want to use? > > Create a mirror on disk with valid data (note that the last sector of the > disk will be overwritten). Add another disk to this mirror, so it will > be synchronized with existing disk: > > gmirror label -v -b round-robin data da0 add -s <very large value> like -s 1048576 to prevent splitting one request on 2 disks. except this - all right. > gmirror insert data da1 > Though in my case, da0 and da1 will be ad4 and ad5. This seems to be > the one I'm looking for, I'm just scared of wiping out more than I > bargain for. assuming you already have system on say ad4, make gmirror on ad5, copy everything, make sure it's bootable (bsdlabel -B ...), boot from it, if all works, add ad4 to the mirror effectively overwriting things. add in loader.conf vfs.root.mountfrom="ufs:mirror/dataa" - assuming your system is on partition a of your mirror. HINT - you DO NOT have to mirror whole drive. you may mirror a partition(s), living some of them unmirrored.
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