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[root@localhost ~]# lsblk NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT sda             8:0    0   40G  0 disk ├─sda1          8:1    0  512M  0 part /boot └─sda2          8:2    0 25.5G  0 part   ├─rhel-swap 253:0    0  512M  0 lvm  [SWAP]   └─rhel-root 253:1    0   25G  0 lvm  / sr0            11:0    1  3.6G  0 rom  /mnt/cdrom [root@localhost ~]# fdisk /dev/sda 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. Command (m for help): p Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 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: 0x0009ed86    Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048     1050623      524288   83  Linux /dev/sda2         1050624    54544383    26746880   8e  Linux LVM Command (m for help): n Partition type:    p   primary (2 primary, 0 extended, 2 free)    e   extended Select (default p): Using default response p Partition number (3,4, default 3): First sector (54544384-83886079, default 54544384): Using default value 54544384 Last sector, +sectors or +size{K,M,G} (54544384-83886079, default 83886079): +5G     Partition 3 of type Linux and of size 5 GiB is set Command (m for help): p Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 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: 0x0009ed86    Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048     1050623      524288   83  Linux /dev/sda2         1050624    54544383    26746880   8e  Linux LVM /dev/sda3        54544384    65030143     5242880   83  Linux 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. [root@localhost ~]# partprobe /dev/sda 　[root@localhost ~]# lsblk 　NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT 　sda 8:0 0 40G 0 disk 　├─sda1 8:1 0 512M 0 part /boot 　├─sda2 8:2 0 25.5G 0 part 　│ ├─rhel-swap 253:0 0 512M 0 lvm [SWAP] 　│ └─rhel-root 253:1 0 25G 0 lvm / 　└─sda3 8:3 0 5G 0 part 　sr0 11:0 1 3.6G 0 rom /mnt/cdrom