Creation deletion of Logical Partition and extended
1) List the Partition Table
[root@localhost ~]# fdisk -l
2) Create Extended Partition on the New disk /dev/sdb
fdisk /dev/sdb
[root@localhost ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xca3de5fc.
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): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-13054, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054):
Using default value 13054
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
4) Delete the extended partition
[root@localhost ~]# fdisk /dev/sdb
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): d
Selected partition 1
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
5) Add Logical Partition on the Disk
[root@localhost ~]# fdisk /dev/sdb
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): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-13054, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054):
Using default value 13054
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
6) Format New Logical partition as ext4
[root@localhost ~]# mkfs.ext4 /dev/sdb1
mkdir /backup
[root@localhost ~]# mount /dev/sdb1 /backup/
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 52G 2.6G 47G 6% /
tmpfs tmpfs 528M 0 528M 0% /dev/shm
/dev/sda1 ext4 508M 32M 450M 7% /boot
/dev/mapper/VolGroup-lv_home
ext4 54G 189M 51G 1% /home
/dev/sdb1 ext4 106G 197M 101G 1% /backup
Add in the fstab so after reboot we can make the disk available
/dev/sdb1 /backup ext4 defaults 1 2
7) Remove Logical partition
umount /backup/
remove form fstab
root@localhost ~]# fdisk /dev/sdb
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): d
Selected partition 1
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
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