pvmove thin volume doesn't move

["Brian J. Murrell" <brian@interlinx.bc.ca>]

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Hi.

I've added a new (faster) disk to a VG and now want to move a thinly
provisioned LV to the new PV.  When I try it doesn't find any data to
move though:

# pvmove -n /dev/rootvol_tmp/var /dev/sda7 /dev/sdc
  No data to move for rootvol_tmp.

both disks are in the VG though:

# pvs
  PV         VG            Fmt  Attr PSize    PFree   
  /dev/sda7  rootvol_tmp   lvm2 a--   170.89g    3.62g
  /dev/sdc   rootvol_tmp   lvm2 a--  <279.46g <151.46g

# lvdisplay --maps /dev/rootvol_tmp/var 
  --- Logical volume ---
  LV Path                /dev/rootvol_tmp/var
  LV Name                var
  VG Name                rootvol_tmp
  LV UUID                jurBnO-APSJ-fbp1-DhWZ-8475-vrDh-heccun
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-11-10 11:11:17 -0500
  LV Pool name           pool00
  LV Status              available
  # open                 1
  LV Size                55.27 GiB
  Mapped size            96.94%
  Current LE             14150
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:17
   
  --- Segments ---
  Virtual extents 0 to 14149:
    Type                thin
    Device ID           3

The LV is a thinly provisioned LV:

# lvs
  LV              VG            Attr       LSize    Pool   Origin Data%  Meta%  Move Log Cpy%Sync Convert
  pool00          rootvol_tmp   twi-aotz-- <138.88g               80.32  40.28                           
  var             rootvol_tmp   Vwi-aotz--   55.27g pool00        96.94

Any ideas?

Cheers,
b.

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