I have been bitten by this.
# pvmove -v /dev/sdc1
Wiping cache of LVM-capable devices
Finding volume group "Ext"
Archiving volume group "Ext" metadata (seqno 20).
Creating logical volume pvmove0
Moving 0 extents of logical volume Ext/lvol0
Moving 0 extents of logical volume Ext/baks
Moving 1600 extents of logical volume Ext/data
Found volume group "Ext"
Updating volume group metadata
Creating volume group backup "/etc/lvm/backup/Ext" (seqno 21).
Found volume group "Ext"
Found volume group "Ext"
Suspending Ext-data (254:6)
Found volume group "Ext"
Creating Ext-pvmove0
Loading Ext-pvmove0 table
device-mapper: reload ioctl failed: Invalid argument
ABORTING: Temporary mirror activation failed. Run pvmove --abort.
Found volume group "Ext"
Loading Ext-pvmove0 table
device-mapper: reload ioctl failed: Invalid argument
Loading Ext-data table
device-mapper: reload ioctl failed: Invalid argument
pvmove --abort hangs, but I was able to recover without a reboot using
# dmsetup remove Ext-pvmove0
and
# dmsetup resume Ext-data
I believe this is a bug in version 1.02.06 of libdevmapper1.02 and would
be fixed by upgrade to >=1.02.07.
See Debian bugs #383418 and #409435
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=383418
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=409435
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Edgy: pvmove (LVM) failes with device_mapper ioctl errors
https://launchpad.net/bugs/65813
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