作者：尹正杰
版权声明：原创作品，谢绝转载！否则将追究法律责任。
gdisk工具擅长管理GPT分区。接下来我们就简单介绍一下该工具的使用。
一.分区表概述
博主推荐阅读:
https://developer.aliyun.com/article/1604391
二.安装gdisk
gdisk工具和fdisk很类似，都是对磁盘进行分区管理的开源工具。如下图所示，fdisk对于GPT分区方式目前只是实验性的，因此生成环境建议大家谨慎使用。
我们的gdisk工具很擅长处理GPT分区方式,不仅如此还支持MBR以及APM和BSD分区方式(虽说后两者分区方式使用相对较少,感兴趣的同学可以自行查阅相关资料)。
综上所述,如果生产环境您使用GPT分区推荐使用gdisk工具，最小化安装的系统需要手动安装哟~
[root@yinzhengjie.com ~]# yum -y install gdisk
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: mirror.bit.edu.cn
* extras: mirrors.bfsu.edu.cn
* updates: mirror.bit.edu.cn
base | 3.6 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/4): updates/7/x86_64/primary_db | 168 kB 00:00:00
(2/4): extras/7/x86_64/primary_db | 190 kB 00:00:00
(3/4): base/7/x86_64/group_gz | 153 kB 00:00:01
(4/4): base/7/x86_64/primary_db | 6.1 MB 00:00:03
Resolving Dependencies
--> Running transaction check
---> Package gdisk.x86_64 0:0.8.10-3.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================================================
Package Arch Version Repository Size
============================================================================================================================================================================
Installing:
gdisk x86_64 0.8.10-3.el7 base 190 k
Transaction Summary
============================================================================================================================================================================
Install 1 Package
Total download size: 190 k
Installed size: 660 k
Downloading packages:
gdisk-0.8.10-3.el7.x86_64.rpm | 190 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : gdisk-0.8.10-3.el7.x86_64 1/1
Verifying : gdisk-0.8.10-3.el7.x86_64 1/1
Installed:
gdisk.x86_64 0:0.8.10-3.el7
Complete!
[root@yinzhengjie.com ~]#
[root@yinzhengjie.com ~]# yum -y install gdisk #安装gdisk工具
三.gdisk工具使用案例
[root@yinzhengjie.com ~]# gdisk /dev/sdc #进入到gdisk工具的管理界面
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries.
Command (? for help):
1>.查看帮助信息
Command (? for help): ?
b back up GPT data to a file
c change a partition's name
d delete a partition
i show detailed information on a partition
l list known partition types
n add a new partition
o create a new empty GUID partition table (GPT)
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s sort partitions
t change a partition's type code
v verify disk
w write table to disk and exit
x extra functionality (experts only)
? print this menu
Command (? for help):
2>.新建分区
Command (? for help): n #执行新建分区的指令
Partition number (1-128, default 1):
First sector (34-838860766, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-838860766, default = 838860766) or {+-}size{KMGTP}: +100G #这里的结束位置我这里写+100G
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): #我们可以自定义创建分区的代码(默认是8300),输入字母"l"可以查看所有的代码标签哟~通常情况下我们直接回车即可。
Changed type of partition to 'Linux filesystem'
Command (? for help):
3>.查看分区信息
Command (? for help): p
Disk /dev/sdc: 838860800 sectors, 400.0 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 37B1331C-C436-48CA-B5A6-B157D0BB9AD0
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 838860766
Partitions will be aligned on 2048-sector boundaries
Total free space is 629145533 sectors (300.0 GiB)
Number Start (sector) End (sector) Size Code Name
1 2048 209717247 100.0 GiB 8300 Linux filesystem
Command (? for help):
4>.保存分区信息并退出
Command (? for help): w #保存分区信息到磁盘(默认所有的修改都放在内存中，直到执行当前的写入指令才会写入到磁盘。)
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): Y #注意哈，这里得输入字母"Y"才能保存成功哟~
OK; writing new GUID partition table (GPT) to /dev/sdc.
The operation has completed successfully.
[root@yinzhengjie.com ~]#
5>.命令行中查看gpt的分区信息
[root@yinzhengjie.com ~]# gdisk -l /dev/sdc
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sdc: 838860800 sectors, 400.0 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): C4A5426E-BE89-46EE-B842-3CAC96156388
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 838860766
Partitions will be aligned on 2048-sector boundaries
Total free space is 629145533 sectors (300.0 GiB)
Number Start (sector) End (sector) Size Code Name
1 2048 209717247 100.0 GiB 8300 Linux filesystem
[root@yinzhengjie.com ~]#
[root@yinzhengjie.com ~]# fdisk -l /dev/sdc
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sdc: 429.5 GB, 429496729600 bytes, 838860800 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: gpt
Disk identifier: C4A5426E-BE89-46EE-B842-3CAC96156388
# Start End Size Type Name
1 2048 209717247 100G Linux filesyste Linux filesystem
[root@yinzhengjie.com ~]#
[root@yinzhengjie.com ~]#
[root@yinzhengjie.com ~]# fdisk -l /dev/sdc #对于GPT分区的磁盘虽然也可以使用fdisk工具查看，但还是推荐大家使用gdisk去管理GPT分区。
