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[linux-lvm] pvmove doesn't work the way the man page says



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LVM 2.02.66-4ubuntu7 on Ubuntu 12.04 LTS:

The man page for pvmove says it creates many temporary mirror segments
to sync each segment then breaks the mirror and mirrors the next
segment, thus allowing the move to be resumed after a reboot
approximately where it left off.

This does not appear to be the case.  Looking at dmsetup table during
a move of two logical volumes, there is one mirror segment for the
entire logical volume being moved, and a linear for the next logical
volume.  So it appears that logical volumes are copied as a whole unit
and a reboot will restart the copy from the beginning.

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