GEOM_RAID in GENERIC is harmful

[Alexander Motin]

On 13.09.2012 13:01, Eugene Grosbein wrote:
> 13.09.2012 16:51, Alexander Motin wrote:
>
>>> That's makes users very angry when production server fails to boot
>>> with GENERIC kernel after correctly performed upgrade.
>>>
>>> GEOM_RAID compiled in GENERIC should be deactivated and require activation
>>> with some loader knob. Also, we need distinct RELEASE NOTES warning about the issue.
>>
>> Problem of on-disk metadata garbage is not limited to GEOM_RAID. For
>> example, I had case where remainders of old UFS file system were found
>> by GEOM_LABEL and ZFS incorrectly attached to it instead of proper GPT
>> partition, making other partitions inaccessible. Does it mean we should
>> remove GEOM_LABEL also? I don't think so. All what GEOM_RAID is guilty
>> in is that it was not in place for 9.0 release. If we remove it now, it
>> will just postpone the problem for later time or will never be able to
>> add it again because of the same reasons.
>
> We must be ready for lots of angry users of 9.1-RELEASE then
> and have BIG RED WARNING in RELEASE NOTES.

Warning is good, but I don't think it will be "lots". It is enabled in 
9-STABLE for some time now and I haven't seen many complains. If re@ 
permit to MFC r240465 in few days, solution for those who may need it 
will be simple: kern.geom.raid.enable=0.

-- 
Alexander Motin