root@pve1:~# lvremove /dev/pve/data
Do you really want to remove active logical volume pve/data? [y/n]: y
Consider pruning pve VG archive with more than 151 MiB in 1917 files (see archiving settings in lvm.conf).
Logical volume "data" successfully removed.
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root@pve1:~# vgs
VG #PV #LV #SN Attr VSize VFree
pve 1 2 0 wz--n- <2.00t <1.90t
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root@pve1:~# lvcreate -L 800G -T pve/data
Thin pool volume with chunk size 512.00 KiB can address at most 127.00 TiB of data.
WARNING: Pool zeroing and 512.00 KiB large chunk size slows down thin provisioning.
WARNING: Consider disabling zeroing (-Zn) or using smaller chunk size (<512.00 KiB).
Consider pruning pve VG archive with more than 151 MiB in 1918 files (see archiving settings in lvm.conf).
Consider pruning pve VG archive with more than 151 MiB in 1919 files (see archiving settings in lvm.conf).
Consider pruning pve VG archive with more than 151 MiB in 1920 files (see archiving settings in lvm.conf).
Logical volume "data" created.
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root@pve1:~# mkfs.ext4 /dev/pve/backup
mke2fs 1.47.2 (1-Jan-2025)
Discarding device blocks: done
Creating filesystem with 300102656 4k blocks and 75030528 inodes
Filesystem UUID: 15bd4426-57d5-4433-b12f-0ba3d3c23553
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done
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root@pve1:~# mkdir -p /mnt/backup
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root@pve1:~# echo "/dev/pve/backup /mnt/backup ext4 defaults 0 2" >> /etc/fstab
mount -a
mount: (hint) your fstab has been modified, but systemd still uses
the old version; use 'systemctl daemon-reload' to reload.
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root@pve1:~# systemctl daemon-reload
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root@pve1:~# df -h | grep backup
/dev/mapper/pve-backup 1.1T 2.1M 1.1T 1%
/mnt/backup