Create a filesystem on Linux

In this article, I will show how to create a filesystem and mount it on Linux.

Existing filesystem:

[root@orclprd Packages]# df -h
Filesystem            Size  Used Avail Use% Mounted on
                       13G  4.7G  7.4G  39% /
tmpfs                 2.8G   76K  2.8G   1% /dev/shm
/dev/sda1             477M   67M  381M  15% /boot
/dev/sr0              3.6G  3.6G     0 100% /media/OL6.6 x86_64 Disc 1 20141018
[root@orclprd ~]# cd /dev
[root@orclprd dev]# ls sd*
sda  sda1  sda2  sdb

Create a logical partition:

[root@orclprd dev]# fdisk sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xa40c4950.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   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): n
Command action
   e   extended
   p   primary partition (1-4)
Partition number (1-4): 1
First cylinder (1-3916, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-3916, default 3916):
Using default value 3916

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

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

Make filesystem format:

[root@orclprd dev]# mkfs -t ext3 /dev/sdb1
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1966080 inodes, 7863809 blocks
393190 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

Get UUID for created filesystem:

[root@orclprd dev]# blkid /dev/sdb1
/dev/sdb1: UUID="3c468b4d-5c12-42ae-b633-41555c89c6d4" SEC_TYPE="ext2" TYPE="ext3"

Add to FSTAB:

[root@orclprd dev]# mkdir /u01

[root@orclprd dev]# cat /etc/fstab

# /etc/fstab
# Created by anaconda on Thu Nov 16 00:34:47 2023
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/vg_orclprd-lv_root /                       ext4    defaults        1 1
UUID=71c1deab-baa3-4510-8e2a-c92de847fe82 /boot                   ext4    defaults        1 2
/dev/mapper/vg_orclprd-lv_swap swap                    swap    defaults        0 0
UUID=3c468b4d-5c12-42ae-b633-41555c89c6d4       /u01    ext3    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0

Mount and Validate:

[root@orclprd dev]# mount -a
[root@orclprd dev]# df -h
Filesystem            Size  Used Avail Use% Mounted on
                       13G  4.7G  7.4G  39% /
tmpfs                 2.8G   76K  2.8G   1% /dev/shm
/dev/sda1             477M   67M  381M  15% /boot
/dev/sr0              3.6G  3.6G     0 100% /media/OL6.6 x86_64 Disc 1 20141018
/dev/sdb1              30G  173M   28G   1% /u01