Date: Thu, 8 Mar 2012 14:13:47 +0100 From: Rainer Duffner <rainer@ultra-secure.de> To: Martin Simmons <martin@lispworks.com> Cc: freebsd-fs@freebsd.org Subject: Re: FreeBSD 9 and gmirror /geom raid Message-ID: <20120308141347.50b06ea5@suse2.iptech.internal> In-Reply-To: <201203081135.q28BZmVJ027236@higson.cam.lispworks.com> References: <op.was0h7dqdwq0iw@davepro.local> <CAOjFWZ5Bc5MZp4LSEHAiuZfoy7vvqs6mJ0a9c=n5n0SmaZpGRA@mail.gmail.com> <4F583C63.60809@contactlab.com> <201203081135.q28BZmVJ027236@higson.cam.lispworks.com>
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Am Thu, 8 Mar 2012 11:35:48 GMT schrieb Martin Simmons <martin@lispworks.com>: > >>>>> On Thu, 08 Mar 2012 05:58:11 +0100, Davide D'Amico said: > > > > Il 08/03/12 00:02, Freddie Cash ha scritto: > > > On Wed, Mar 7, 2012 at 6:14 AM, Davide D'Amico > > > <davide.damico@contactlab.com> wrote: > > >> Hi, I have a server DELL R210 with two sata drives: > > >> ada0 at ahcich0 bus 0 scbus0 target 0 lun 0 > > >> ada0:<SAMSUNG HE253GJ 1AJ30001> ATA-8 SATA 2.x device > > >> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > > >> ada0: Command Queueing enabled > > >> ada0: 238418MB (488281250 512 byte sectors: 16H 63S/T 16383C) > > >> ada0: Previously was known as ad4 > > >> ada1 at ahcich1 bus 0 scbus1 target 0 lun 0 > > >> ada1:<SAMSUNG HE253GJ 1AJ30001> ATA-8 SATA 2.x device > > >> ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > > >> ada1: Command Queueing enabled > > >> ada1: 238418MB (488281250 512 byte sectors: 16H 63S/T 16383C) > > >> ada1: Previously was known as ad6 > > >> > > >> Previously (8.x) - when I didn't use a hw raid - I used to > > >> install freebsd in a drive (i.e. ad4), boot from it and then: > > >> > > >> # sysctl kern.geom.debugflags=16 > > >> # gmirror label -v -b round-robin data ad4 > > >> # gmirror insert data ad6 > > >> // Modification to /etc/fstab > > >> // reboot > > >> > > >> How could accomplish to the same task with 9.0-RELEASE? > > > http://people.freebsd.org/~rse/mirror/ > > > > > Hi Freddie, and thanks for your link. > > > > I followed that procedure until 9.0-RELEASE but the new installer > > uses GPT as the default partition schema, which seems incompatible > > with gmirror. > > > > I noticed in the handbook > > (http://www.freebsd.org/doc/handbook/geom-mirror.html): > > "The following procedure is also incompatible with the default > > installation settings of FreeBSD 9./X/which use the newGPTpartition > > scheme. GEOM will overwriteGPTmetadata, causing data loss and > > possibly an unbootable system." > > > > So I think that the old procedure is no more useful. > > I think the problem with the old procedure is that it mirrors the > whole disk. This fails because both gmirror and GPT store data in the > last few blocks of the disk. > > If you create gmirror(s) at the GPT partition level instead, then it > should be safe. maybe like this: http://blather.michaelwlucas.com/archives/1071 Haven't tried it, but I may need it at some point...
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