Date: Sun, 18 Mar 2012 14:01:39 +0100 From: rank1seeker@gmail.com To: hackers@freebsd.org Subject: BUG: REL 9.0 - MD malloc of custom sector size Message-ID: <20120318.130139.003.1@DOMY-PC>
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man mdconfig
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-S sectorsize to use for malloc backed device
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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
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