registry team mailing list archive

[Danny Wood <599255@xxxxxxxxxxxxxxxxxx>]

Hmmm.

I think there is an issue with the offset in that case.
And earlier I was fooling myself by reading the same MBR back twice.

Its hard to reverse engineer over a long distance. If I could find a
cheap promise controller I would buy one to have a go at fixing this but
unfortunately it looks like we have hit a snag. Without being able to
access the disks and the hardware directly I don't think we can go much
further.

I have done some digging and it appears that the promise fakeraid
controllers had issues with the 32-bit LBA (which is the issue here) and
this is why I cannot really see how to fix it easily. They fixed it with
a patch in their drivers and firmware. But they are a very closed source
group and I couldn't find any more info. I have emailed them but I don't
expect a response.

Sorry but it looks like we aren't going to solve this issue.

As a workaround you could create a third RAID disk. So you have 2 x 2TB
and 1 x 500GB drives. This will allow you to see all drives in all OSes
and have the speed advantage of RAID0.

-- 
dmraid fails to read promise RAID sector count larger than 32-bits
https://bugs.launchpad.net/bugs/599255
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