Re: Time to deprecate old RAID formats?

[Michael Tokarev <mjt@tls.msk.ru>]

Justin Piszcz wrote:
> 
> On Fri, 19 Oct 2007, Doug Ledford wrote:
> 
>> On Fri, 2007-10-19 at 13:05 -0400, Justin Piszcz wrote:
[]
>>> Got it, so for RAID1 it would make sense if LILO supported it (the
>>> later versions of the md superblock)
>>
>> Lilo doesn't know anything about the superblock format, however, lilo
>> expects the raid1 device to start at the beginning of the physical
>> partition.  In otherwords, format 1.0 would work with lilo.
> Did not work when I tried 1.x with LILO, switched back to 00.90.03 and
> it worked fine.

There are different 1.x - and the difference is exactly this -- location
of the superblock.  In 1.0, superblock is located at the end, just like
with 0.90, and lilo works just fine with it.  It gets confused somehow
(however I don't see how really, because it uses bmap() to get a list
of physical blocks for the files it wants to access - those should be
in absolute numbers, regardless of the superblock locaction) when the
superblock is at the beginning (v 1.1 or 1.2).

/mjt