PDC arrays > 2 TB and non 512 byte dm sector size

Ian Stakenvicius, Aerobiology Research ian at aerobiology.ca
Fri Nov 23 14:27:05 UTC 2012

On 21/11/12 04:08 PM, Phillip Susi wrote:
> On 11/21/2012 9:19 AM, Heinz Mauelshagen wrote:
>>> No, dm goes by hard sector sizes, not pretended ones.
> What do you mean?  dm devices are virtual so there is no "hard" sector
> size; it's all virtual.  Are you saying it is hard coded to report 512
> bytes and can't be changed?

I'm guessing that what Heinz means is that dmraid reads superblocks or
whatever in accordance with the sector size on the hardware itself
("hard" = hardware level); since it does this in order to feed the
correct setup info to device-mapper it would not be acting on virtual

Just my interpretation though, please correct me if i'm wrong.

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