Миграция логического раздела с помощью снапшота

File descriptor 7 (pipe:[60950]) leaked on pvscan invocation. Parent PID 19282: bash
  PV /dev/sda4   VG sqlserver   lvm2 [3.56 TiB / 1.53 TiB free]
  Total: 1 [3.56 TiB] / in use: 1 [3.56 TiB] / in no VG: 0 [0   ]

File descriptor 7 (pipe:[60950]) leaked on vgscan invocation. Parent PID 19282: bash
  Reading all physical volumes.  This may take a while...
  Found volume group "sqlserver" using metadata type lvm2

File descriptor 7 (pipe:[60950]) leaked on lvdisplay invocation. Parent PID 19282: bash
  --- Logical volume ---
  LV Name                /dev/sqlserver/svnserver
  VG Name                sqlserver
  LV UUID                GKXjUf-OL12-2XD5-mpXv-5uBa-S8Pf-1Trt9J
  LV Write Access        read/write
  LV snapshot status     source of
                         /dev/sqlserver/snap [active]
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

--- Logical volume ---
  LV Name                /dev/sqlserver/snap
  VG Name                sqlserver
  LV UUID                A38WHJ-R6kh-vDoJ-QlMz-Zwe4-KYac-6lM3TU
  LV Write Access        read/write
  LV snapshot status     active destination for /dev/sqlserver/svnserver
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  COW-table size         100.00 GiB
  COW-table LE           25600
  Allocated to snapshot  0.00%
  Snapshot chunk size    4.00 KiB
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:6

mount: you must specify the filesystem type