FreeBSD 9 and gmirror /geom raid

[Davide D'Amico]

Il 08/03/12 00:02, Freddie Cash ha scritto:
> On Wed, Mar 7, 2012 at 6:14 AM, Davide D'Amico
> <davide.damico at 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.

Thanks,
d.