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SubjectRe: [PATCHSET] block,scsi,libata: implement alt_size
Dan Williams wrote:
> On Thu, Apr 30, 2009 at 1:00 PM, Jeff Garzik <jeff@garzik.org> wrote:
>> Tejun Heo wrote:
>>> Hello,
>>>
>>> Jeff Garzik wrote:
>>>> <shrug> I suppose...
>>>>
>>>> It just seems like a nasty hack, but unfortunately I don't see
>>>> anyone stepping up to do it properly -- with a DM device
>>>> automatically layered on top that splits the device into separate
>>>> regions: one block device for the 'regular' area, and one for the
>>>> HPA.
>>> Isn't that more hacky? I don't know. All that dm needs to know is
>>> the location of the metadata which is located w.r.t. the end of the
>>> device which might be at a different location if BIOS tried to pull
>>> silly stunts. So, exporting the size BIOS might have used seems like
>>> a straight forward solution to me.
>> "<shrug> I suppose" is basically a reluctant ack, in the absence of other
>> solutions :)
>>
>
> Couldn't the "fix" also just be a note to users to disable ignore_hpa
> if they notice that there raid arrays are not assembling correctly?

I don't know. If it doesn't work automatically, the solution really
isn't worth much. People generally don't (shouldn't need to) have any
idea what HPA is. It basically boils down to "Linux doesn't support
RAID". :-)

Maybe we should just put this issue to the rest and strongly advise
people against BIOS raids.

Thanks.

--
tejun


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