Device /dev/sda4 not found (or ignored by filtering).

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# fdisk /dev/sda

Command (m for help): p

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes, 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a3dd7

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     4196351     2097152   83  Linux
/dev/sda2         4196352   172148735    83976192   8e  Linux LVM

CREATE NEW PARTITION
Command (m for help): n
Partition type:
p   primary (2 primary, 0 extended, 2 free)
e   extended
Select (default p): p
Partition number (1-4, default 3):
Using default value 3
First sector (172148736-1953525167, default 172148736):
Using default value 172148736
Last sector, +sectors or +size{K,M,G} (172148736-1953525167, default 1953525167):
Using default value 1953525167
Partition 3 of type Linux and of size 849.4 GiB is set

WRITE

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

# partprobe

CREATE PHYSICAL VOLUME

# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created