fdisk命令详解

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NAME
fdisk - Partition table manipulator for Linux

SYNOPSIS
fdisk [-uc] [-b sectorsize] [-C cyls] [-H heads] [-S sects]
device

fdisk -l [-u] [device...] 列出指定的外围设备的分区表状况。
[root@nginx ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a87b0

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 141 614400 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3 141 1306 9358336 83 Linux
[root@nginx ~]#

fdisk -s partition... <分区编号> 将指定的分区大小输出到标准输出上，单位为区块。

fdisk -v 显示版本信息。

fdisk -h

一、分区要点
(1)任意多个主分区，但要求（1<=主分区<=小于等于4。 例如，4个主分区，3个主分区 2个主分区 或一个主分区)

(2)扩展分区和主分区， 3个主分区+一个扩展分区 1<=主分区<=小于等于4 例如：3个主分区+1个扩展分区 或两个主分区+1个扩展分区 1个主+1个扩展分区

(3)如果磁盘分成4个磁盘分区，那么一般会用： P+P+P+P P+P+P+E

二、[root@nginx-master opt]# fdisk --help 查看分区帮助
[root@nginx-master opt]# fdisk -l 查看分区列表
1.[root@nginx-master opt]# fdisk /dev/sda

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 查看分区
m print this menu 帮助信息
n add a new partition 新建分区
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):
2. n 新建分区
e extended
p primary partition（1-4）
3.w 分区完成后w保存
4.[root@nginx-master opt]# partprobe
5.[root@nginx-master opt]# mkfs.ext4 /dev/sda
4.写入 fs /etc/fstab