why are DATA partitions not consistently reported in CentOS 7?

Question

Why am I getting inconsistent/conflicting pictures of the DATA partitions that were created in the CentOS 7 installation process when I use df -T -h, parted ... print, and fdisk -l? In case it matters, used xfs file system because that was the default.

The Background of the process is:

During a recent installation of CentOS 7, I chose Manual Partitioning in the Installation Destination part of the process. The tutorial in this link contains screen shots illustrating the installation process, and the screen in the process where the DATA partitions are created is shown below (from the same tutorial).

_{(source: tecmint.com)}

In the above screen shot, my installation wizard automatically created a /home DATA partition. I shrunk the auto-created /home partition, and created four new 300 GB DATA partitions called /public, /vpn, /data, and /test using the screen shown in the screen shot, and I then completed the installation.

---

df -T -h results:

---

In the resulting installation, typing df -T -h results in:

[root@localhost ~]# df -T -h
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        50G 1016M   49G   2% /
devtmpfs                devtmpfs  3.8G     0  3.8G   0% /dev
tmpfs                   tmpfs     3.8G     0  3.8G   0% /dev/shm
tmpfs                   tmpfs     3.8G   17M  3.8G   1% /run
tmpfs                   tmpfs     3.8G     0  3.8G   0% /sys/fs/cgroup
/dev/sda2               xfs       494M  139M  355M  29% /boot
/dev/mapper/centos-home xfs       605G   33M  605G   1% /home
/dev/sda1               vfat      200M  9.8M  191M   5% /boot/efi
/dev/mapper/centos-01   xfs       280G   33M  280G   1% /public
/dev/mapper/centos-02   xfs       280G   33M  280G   1% /data
/dev/mapper/centos-03   xfs       280G   33M  280G   1% /test
/dev/mapper/centos-00   xfs       280G   33M  280G   1% /vpn

---

**parted ... quit results:

---

However, parted does not seem to see the four new DATA partitions, as shown below:

[root@localhost ~]# parted
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: ATA WDC WD20EZRX-00D (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                  Flags
 1      1049kB  211MB   210MB   fat16        EFI System Partition  boot
 2      211MB   735MB   524MB   xfs
 3      735MB   1912GB  1911GB

---

fdisk -l results:

---

The fdisk -l results seem to be a blend of the parted and df results shown above, but here treating the four new partitions as a separate category:

[root@localhost ~]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: gpt

#         Start          End    Size  Type            Name
 1         2048       411647    200M  EFI System      EFI System Partition
 2       411648      1435647    500M  Microsoft basic 
 3      1435648   3734071295    1.8T  Microsoft basic 

Disk /dev/mapper/luks-49495fd0-6120-48d9-915a-d88903765021: 1911.1 GB, 1911107354624 bytes, 3732631552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-swap: 8187 MB, 8187281408 bytes, 15990784 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-home: 649.2 GB, 649223733248 bytes, 1268015104 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-00: 300.0 GB, 299997593600 bytes, 585932800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-01: 300.0 GB, 299997593600 bytes, 585932800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-02: 300.0 GB, 299997593600 bytes, 585932800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/centos-03: 300.0 GB, 299997593600 bytes, 585932800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

(parted) quit  

Answer 1

It appears you chose to use logical volumes (LVM) rather than partitions. These are not partitions, and are managed using a different mechanism.

Try using an LVM command like sudo lvm lvs. This should list the logical volumes.