[Xen-devel] trying to get a domU to manage lvm pvs

[Tupshin Harper <tupshin@xxxxxxxxxxx>]

I'm trying to have a domU run lvm and manage one vg, a few pvs, and lots 
of lvs without the dom0 having any role in the situation.
To simplify things as much as possible, I set up a test with one pv, 
that is recognized as such by the dom0, and I'm using the same dom0 
kernel for my domU.
I did the following:
* pvcreate /dev/hda6 from dom0, and verified that pvscan showed it
* I then explicitly excluded it in dom0's lvm filter, and verified that 
pvscan did not see it
* I added an entry ('phy:hda6,hda6,w') to the domU's  disk configuration
* started the domU
* did a "dd if=/dev/hda6 | less" and saw that the device existed and 
contained information indication it was  a pv.
* copied the exact lvm.conf that I was using in dom0 before adding the 
hda6 exclusion
* restarted lvm (and later rebooted the domU just to be certain)
* did a pvscan and pvdisplay /dev/hda6, both of which claimed to not see 
anything
* tried to redo the pvcreate from within the domU and got the message: 
"/dev/hda6: Couldn't find device.  Check your filters?" (triple checked 
the filters)
* noted that /etc/lvm/.cache consistently is getting filled with:
       valid_devices=[
               "/dev/loop0",
               "/dev/loop1",
               "/dev/loop3",
               "/dev/loop4",
               "/dev/loop7",
               "/dev/loop2",
               "/dev/md0",
               "/dev/loop5",
               "/dev/loop6"
       ]
instead of the specific device(s) that I am handing off to the domU. The 
dom0 lvm cache contains none of those entries.
Any suggestions?


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