9.1 and gmirror with GPT?

Warren Block wblock at wonkity.com
Sun Oct 21 14:33:03 UTC 2012

On Sun, 21 Oct 2012, Lucas B. Cohen wrote:

> On 2012.10.20 20:17, freebsd at johnea.net wrote:
>> Just wondering if 9.1 will bring any improvement to the situation of creating a full disk geom mirror while also using GPT partition table?
> I'm curious about what this is about. Could you refer me to an article
> or a discussion where this issue is described ?

The GPT backup partition tables goes at the end of a disk, the same 
place gmirror(8) and other GEOM modules keep metadata.  If GPT 
partitions are created inside a mirror, the backup GPT table is no 
longer at the end of the disk.  Hiroki Sato created a patch which fixed 
the gptboot complaints, but there was concern about the nonstandard 
location of the backup table.

At present, MBR partitioning is recommended with gmirror(8).

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