Re: libata equivalent for hdX=remap63

["Alexander E. Patrakov" <patrakov@ums.usu.ru>]

Alan Cox wrote:
> On Sun, 02 Sep 2007 14:26:29 +0600
> "Alexander E. Patrakov" <patrakov@ums.usu.ru> wrote:
>
>   
>> Hello,
>>
>> sorry if this is a FAQ, but googling for "libata remap63" gives nothing 
>> useful.
>>
>> Some old computers need software like "Ontrack Disk Manager" in order to 
>> see large disks in the other OS. The way to deal with such setup in 
>> Linux was to add "hdX=remap63" to the kernel arguments. However, I 
>> cannot find the equivalent of this option in the new libata-based 
>> drivers. Could you please show how to migrate such systems to libata 
>> without removing the disk manager?
>>     
>
> The remap63 hack is ancient. Since the kernel acquired device mapper its
> also unneccessary as you can use device mapper to set up a 63 sector
> offset volume.
>
> I'm amazed anyone is still using it but the right way to handle it on a
> vaguely modern system isn't more kernel hacks but to teach dmraid to
> handle it. If you've got an example of what the layout looks like
> (especially if there is a way to autodetect it) then talk to Heinz (cc'd)
> about getting it added to dmraid.
>   

Thanks Alan,

this is actually not my system, but a system of a user of my Live CD. I 
already asked him to mail me the first megabyte of his hard disk, but 
let me wait 24 hours for a reply. Would this information be enough for 
adding support for this into dmraid?

As for autodetection, I am really not sure. The user says that kernels 
prior to 2.5.70 had this autodetection built-in.

-- 
Alexander E. Patrakov