How to configure a new partition using fdisk

Configurare noua (How To)

Situatie

How to configure a new partition on a new disk for a dedicated server, or a virtual machine.

Solutie

The lsblk command with out any argument will print out the block devices in a tree format. Look for names, such as sda, sdb, etc. The top level denotes the disk and the first level children represent the partitions with in the block.

[root@OL4SAP001 DVD]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 34G 0 part
├─vgroot00-root 249:0 0 30G 0 lvm /
└─vgroot00-swap 249:1 0 4G 0 lvm [SWAP]
...
sdf 8:80 0 15G 0 disk
sdg 8:96 0 30G 0 disk
sdh 8:112 0 20G 0 disk <--- note the disk
sdi 8:128 0 50G 0 disk
...
sdm 8:192 0 50G 0 disk
└─vgoracleO19-lvoracleO19 249:5 0 25G 0 lvm /oracle/O19
sdn 8:208 0 30G 0 disk
└─sdn1 8:209 0 30G 0 part /SOFTWARE/DVD/19c
sr0 11:0 1 1024M 0 rom

Chose the disk and add 1 single partition for the entier size (disk)

[root@OL4SAP001 DVD]# fdisk /dev/sdh
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xc561fdfe.

Command (m for help): m <--- list the options for fdisk
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): p <--- list the partition table

Disk /dev/sdh: 21.5 GB, 21474836480 bytes, 41943040 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 label type: dos
Disk identifier: 0xc561fdfe

Device Boot Start End Blocks Id System

Command (m for help): n <--- new partition
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p <--- primary type
Partition number (1-4, default 1): 1 <--- partition number
First sector (2048-41943039, default 2048): <--- default if you want the partition to start from the beginning of the disk
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): <--- default if you want your disk to have one single big partition (complete disk) 
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set

Command (m for help): p <--- list again the partition table

Disk /dev/sdh: 21.5 GB, 21474836480 bytes, 41943040 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 label type: dos
Disk identifier: 0xc561fdfe

Device Boot Start End Blocks Id System
/dev/sdh1 2048 41943039 20970496 83 Linux

Command (m for help): w <--- write table to disk and exit
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

[root@OL4SAP001 DVD]# fdisk -l /dev/sdh <--- check again the specific disk

Disk /dev/sdh: 21.5 GB, 21474836480 bytes, 41943040 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 label type: dos
Disk identifier: 0xc561fdfe

Device Boot Start End Blocks Id System
/dev/sdh1 2048 41943039 20970496 83 Linux
[root@OL4SAP001 DVD]#

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