Date: Thu, 08 Mar 2012 13:10:38 +0100 From: "Davide D'Amico" <davide.damico@contactlab.com> To: freebsd-fs@freebsd.org Subject: Re: freebsd-fs Digest, Vol 455, Issue 4 Message-ID: <op.waupf0lydwq0iw@davepro.local> In-Reply-To: <20120308120032.C9FF11065672@hub.freebsd.org> References: <20120308120032.C9FF11065672@hub.freebsd.org>
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In data 08 marzo 2012 alle ore 13:00:32, <freebsd-fs-request@freebsd.org> ha scritto: > ------------------------------ > Message: 7 > Date: Thu, 8 Mar 2012 11:35:48 GMT > From: Martin Simmons <martin@lispworks.com> > Subject: Re: FreeBSD 9 and gmirror /geom raid > To: freebsd-fs@freebsd.org > Message-ID: <201203081135.q28BZmVJ027236@higson.cam.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. Yes, indeed but I would continue to mirror the entire disk, rather than single partitions. d.
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