[syslinux] MENU SAVE vs RAID-1

[H. Peter Anvin]

On 05/30/2010 06:09 AM, Sebastian Herbszt wrote:
> Ferenc Wagner wrote:
>> Hi,
>>
>> How does MENU SAVE interact with /boot on RAID-1?  Doesn't it introduce
>> a hidden inconsistency, which may resolve in unexpected ways?  (Like
>> mentioned in extlinux.txt at boot-once support.)
>> -- 
>> Thanks,
>> Feri.
> 
> I assume every mention of RAID-1 in the documentation means software
> RAID-1.
> Hardware RAID-1 implementations should not introduce any problems
> because the
> option ROM should handle the writes/reads correctly. The use of software
> RAID-1
> looks indeed problematic. adv_write can only write to the boot device
> and not the
> mirror. Fake RAID might suffer from this issue too.
> 

Correct.

In practice, it probably means that if you have a disk failure your MENU
SAVE information may be lost, and replaced with the defaults.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.