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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