BUG: REL 9.0 - MD malloc of custom sector size

[rank1seeker at gmail.com]

man mdconfig
----
-S sectorsize to use for malloc backed device
----

I want to create MD device, with sector size of 4 Kb.

It is CRITICAL to NOT append ANY suffixes, when specifing size, via '-s' flag in order to use sectors, to set it's size.
# mdconfig -a -t malloc -S 4096 -s 32768

This should created dev of 128 Mb in size.
32768 sectors * 4 Kb each = 131072 Kb = 128 Mb
Not! It created dev of 16 Mb in size, because sector size remained at 512 bytes.

And look what 'diskinfo' has to say/lie ...
# diskinfo -v md0
md0
        4096            # sectorsize
        16777216        # mediasize in bytes (16M)
        4096            # mediasize in sectors
        0               # stripesize
        0               # stripeoffset

False lines:
  # sectorsize
  # mediasize in sectors (doesn't match '-s 32768')


Does anyone has any advice of creating image / file(vnode) of custom sector sizes (2k, 4k, 8k)
Thanks in advance.


Domagoj Smolčić