[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/cdromnode1（192.168.22.77）target端（ iSCSI服务端）
client1（192.168.22.107）initiator端（ iSCSI客户端）