RFC: Project geom-events
daniel at digsys.bg
Fri Oct 7 20:15:19 UTC 2011
On 07.10.11 22:44, Lev Serebryakov wrote:
> Hello, Perryh.
> You wrote 7 октября 2011 г., 18:06:38:
>>> GPT (and MBR) metadata placement is dictated from outside world,
>>> where is no GEOM and geom_label. They INTENDED to be used on DISKS.
>>> BIOSes should be able to find it :)
>> Certainly GPT and MBR must place an instance of the partition table
>> where the BIOS expects it, but there's no immediately obvious reason
>> why they must regard that instance as their GEOM metadata. GPT puts
>> a second copy in the provider's last block, and AFAICT it could just
>> as well use _that_ instance -- or even a differently-formatted block
>> that included the same data -- as the primary. MBR could do likewise.
> I have deja-vu, that I answered this. Please, read standard. GPT
> _must_ be placed twice -- at first and last sectors (really, more
> than one sectors). By standard. Secondary copy must be at end of
> disk. Period.
Then, "by standard" GPT cannot coexist with GLABEL. Such setup should be
disallowed, or at least big nasty message that you have just shoot
yourself in the leg should be output. (period)
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