[dm-devel] geometry of dm devices......
Darrick J. Wong
djwong at us.ibm.com
Tue Aug 8 22:08:40 UTC 2006
Peter Koutoupis wrote:
>> I understand the HDIO_GETGEO is an unsupported feature to dm
>> devices....but under normal practices how would a normal end-user be
>> able to obtain such geometry from a raw dm device? I have read of
Wow, I'm late to the game. If your kernel/software are new enough, you
can set a dm device's geometry via the DM_DEV_SET_GEOMETRY_CMD ioctl.
iirc, the userland equivalent is:
# dmsetup setgeometry /dev/foo cyl head spt start
...after which HDIO_GETGEO should return nonzero values.
You'll need kernel 2.6.16+ and I think the requisite version of dmsetup
is 1.02. And to my (very limited) knowledge of multipath, geometry is
not set up automatically.
--D
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