there are 3 commands to show status of LVM volumes. pvdisplay, vgdisplay, and lvdisplay
If you are using lvm those commands should show the status. If they show no results then you are probably not using lvm.
This is the result on one of my drives using lvm
$ sudo pvdisplay
--- Physical volume ---
PV Name /dev/nvme0n1p3
VG Name fedora_root
PV Size <1.82 TiB / not usable 1.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476634
Free PE 308698
Allocated PE 167936
PV UUID l81PQ1-jP4v-u4jv-mXAN-B7dy-X0Tf-SOaUr5
$ sudo vgdisplay
--- Volume group ---
VG Name fedora_root
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 13
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <1.82 TiB
PE Size 4.00 MiB
Total PE 476634
Alloc PE / Size 167936 / 656.00 GiB
Free PE / Size 308698 / <1.18 TiB
VG UUID xmenYq-jSk3-9JhA-zOLL-Q2rj-QbK0-7AGCaT
If yours does not show similar then it would appear you are not using lvm for disk management.
That would make what you show with fdisk suspect.
$ sudo fdisk -l
Disk /dev/nvme0n1: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: CT2000P5PSSD8
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 2072D08C-637C-4B03-A3D9-121E741E5EDC
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 688127 686080 335M EFI System
/dev/nvme0n1p2 688128 2441215 1753088 856M Linux extended boot
/dev/nvme0n1p3 2441216 3907028991 3904587776 1.8T Linux LVM
Note that mangement of xfs file systems is different than with ext4. Read up on the differences. As I understand it the xfs file system may be expanded but cannot be shrunk except by backing up the data then removing the old partition to create a new one and restoring to the new smaller partition.
I also understand that to expand the file system requires two steps. First expand the lvm LV without touching the file system. Then expand the file system to fill the new partition size. LVM can do both in one command with ext4 but seems unable to resize the xfs file system.
pvdisplay , vgdisplay , and lvdisplay these commands both with no display.
but as you can see when I do mount command, I can get / just mount on /dev/mapper/fedora-root on / type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)
thanks， after I do sudo lvmdevices --adddev /dev/sda3, then I do pvdislpay, I can see the lvm info.
[sudo] password for simon:
--- Physical volume ---
PV Name /dev/sda3
VG Name fedora
PV Size <929.93 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 238060
Free PE 183020
Allocated PE 55040
PV UUID 3eeckx-7vb8-OnLu-Fcl6-vXGR-q31J-XBWjgL
besides, I extend / success with command sudo lvextend -L +200G --resizefs /dev/fedora/root
Did that extend the xfs file system as well as the LV? Or did it extend the LV without also extending the file system inside the LV?
The command lvdisplay should show the size of the LV. df -h should show the file system info. If the size column in the df output does not match the LV Size from lvdisplay then you may need to manually extend the file system to the full size of the LV.