Lvm – (LVM) Moving data to a different physical volume within the same logical volume

I have a logical volume called storage. It contains two ~1TB physical volumes: /dev/sdc and /dev/sdd. smartctl -a /dev/sdd informs me that /dev/sdd is failing. I can still read data off it and I have just backed up all contents off the LV.

I have about 200GB of actual data — little enough that one of the PVs can hold all of it. I want to remove /dev/sdd from the logical volume and transfer all its data to other PVs (/dev/sdc) on this LV.

pvmove fails because all extents are allocated.

# pvmove /dev/sdd /dev/sdc
  WARNING: No free extents on physical volume "/dev/sdc".
  No specified PVs have space available.

Problem: How do I ensure there is no "real" data on /dev/sdd and safely remove it?

I've elided the other LVM organization not relevant to this question from the output below.

# lvdisplay --maps
  --- Logical volume ---
  LV Path                /dev/spinny/storage
  LV Name                storage
  VG Name                spinny
  LV UUID                LeJEIR-0Zvf-YBLD-GrCT-Kvv0-mcvz-4a66Ib
  LV Write Access        read/write
  LV Creation host, time archiso, 2020-01-01 12:32:05 -0500
  LV Status              available
  # open                 0
  LV Size                <1.82 TiB
  Current LE             476934
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:1

  --- Segments ---
  Logical extents 0 to 238466:
    Type        linear
    Physical volume /dev/sdc
    Physical extents    0 to 238466

  Logical extents 238467 to 476933:
    Type        linear
    Physical volume /dev/sdd
    Physical extents    0 to 238466

# pvdisplay --maps
  --- Physical volume ---
  PV Name               /dev/sdc
  VG Name               spinny
  PV Size               931.51 GiB / not usable 1.71 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238467
  Free PE               0
  Allocated PE          238467
  PV UUID               fMOJ38-TiZZ-DspR-hOy3-4aGn-lKXo-4mYSrU

  --- Physical Segments ---
  Physical extent 0 to 238466:
    Logical volume  /dev/spinny/storage
    Logical extents 0 to 238466

  --- Physical volume ---
  PV Name               /dev/sdd
  VG Name               spinny
  PV Size               931.51 GiB / not usable 1.71 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238467
  Free PE               0
  Allocated PE          238467
  PV UUID               XJ2D5p-l3iP-VBlR-peXB-up1y-ZpNh-UDkcfB

  --- Physical Segments ---
  Physical extent 0 to 238466:
    Logical volume  /dev/spinny/storage
    Logical extents 238467 to 476933

# blkid
/dev/sdc: UUID="fMOJ38-TiZZ-DspR-hOy3-4aGn-lKXo-4mYSrU" TYPE="LVM2_member"
/dev/sdd: UUID="XJ2D5p-l3iP-VBlR-peXB-up1y-ZpNh-UDkcfB" TYPE="LVM2_member"
/dev/mapper/spinny-storage: UUID="108a53d4-dc5a-48b7-971f-b62c617fdb15" BLOCK_SIZE="4096" TYPE="ext4"

# smartctl -a /dev/sdd
smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.6.11-arch1-1] (local build)
# ... clipped ...
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   001   001   051    Pre-fail  Always   FAILING_NOW 14946
  3 Spin_Up_Time            0x0027   170   169   021    Pre-fail  Always       -       2466
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       80
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   095   095   000    Old_age   Always       -       3728
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       80
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       19
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       66
194 Temperature_Celsius     0x0022   103   096   000    Old_age   Always       -       40
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   183   183   000    Old_age   Always       -       2919
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed: unknown failure    90%      3680         -
# 2  Extended offline    Completed: read failure       90%      3663         2064