Re: [RFCI] How best to partition MD/raid devices in 2.6

[Daniel Pittman <daniel@rimspace.net>]

On Fri, 14 Nov 2003, Neil Brown wrote:

[...]

>  3/ define minor numbers of block-major-9 that are larger than 255 to
>    have 6 bits of partitioning information. i.e.
>      9,0 -> md0
>      9,1 -> md1
>       ...
>      9,255 -> md255
>      9,256 -> md256
>      9,257 -> md256p1
>      9,257 -> md256p2
>       ...
>      9,320 -> md257
>      9,321 -> md257p1
>       ...
>    This has least impact on other system and is in some ways simplest,
>    but it has the problem of lack of uniformity.  You wouldn't be able
>    to partition md0, but that isn't a big problem as long as you can
>    partition some md arrays.

How about assigning the partition space above 

  9,0 => md0
  9,1 => md1
  ...
  9,257 => md0p1
  9,258 => md0p2
  ...
  9,320 => md1p1

That should be sensibly backward compatible, I think, and still allow
all the MD devices to be partitioned.

    Daniel

-- 
No, no, you're not thinking, you're just being logical.
        -- Niels Bohr