sgdisk基本用法

简介

sgdisk是Linux下操作GPT分区的工具，就像fdisk是操作MBR分区的工具。关于GPT和MBR的区别请参考：
http://www.anchor.com.au/blog/2012/10/the-difference-between-booting-mbr-and-gpt-with-grub/

使用

新建分区

root@ceph1:~$ sgdisk --help | grep new
-n, --new=partnum:start:end                  create new partition

-n 创建一个分区， -n后的参数分别是： 分区号:起始地址:终止地址
分区号如果为0，代表使用第一个可用的分区号；
起始地址和终止地址可以为0，0代表第一个可用地址和最后一个可用地址；
起始地址和终止地址可以为+/-xxx，代表偏移量，+代表在起始地址后的xxx地址，-代表在终止地址前的xxx地址；

• 创建了一个不指定大小、不指定分区号的分区：

root@ceph1:~# sgdisk -n 0:0:0 /dev/vdd
Creating new GPT entries.
The operation has completed successfully.

root@ceph1:~# lsblk | grep vdd
NAME   MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vdd    253:48   0  40G  0 disk
└─vdd1 253:49   0  20G  0 part

• 创建一个从默认起始地址开始的5G的分区：

root@ceph1:~# sgdisk -n 2:0:+5G /dev/vdd
Creating new GPT entries.
The operation has completed successfully.

root@ceph1:~# lsblk | grep vdd
NAME   MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vdd    253:48   0  40G  0 disk
└─vdd1 253:49   0  20G  0 part
└─vdd2 253:50   0  5G   0 part

查看分区详情

root@ceph1:~$ sgdisk --help | grep info
  -i, --info=partnum                 show detailed information on partition

-i 显示某个分区详情

• 查看第一分区详情：

root@ceph1:~# sgdisk -i 1 /dev/vdd
Partition GUID code: 0FC63DAF-8483-4772-8E79-3D69D8477DE4 (Linux filesystem)
Partition unique GUID: C7EB237F-9A8F-4938-B010-125B3D6D0D4A
First sector: 2048 (at 1024.0 KiB)
Last sector: 41943006 (at 20.0 GiB)
Partition size: 41940959 sectors (20.0 GiB)
Attribute flags: 0000000000000000
Partition name: ''

root@ceph1:~# sgdisk --help |grep print
  -p, --print                                                                                     print partition table

root@ceph1:~# sgdisk -p /dev/sdc
Disk /dev/sdc: 209715200 sectors, 100.0 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 1282C5A8-B97E-4384-B2AD-298168BD782D
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 209715166
Partitions will be aligned on 2048-sector boundaries
Total free space is 199229373 sectors (95.0 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   2            2048        10487807   5.0 GiB     8300

修改分区的 type code

root@ceph1:~$ sgdisk --help | grep typecode
  -t, --typecode=partnum:{hexcode|GUID}        change partition type code

-t 修改某个分区的type code

• 指定第一分区的type code：

root@ceph1:~# sgdisk -t 1:4fbd7e29-9d25-41b8-afd0-062c0ceff05d /dev/vdd
The operation has completed successfully.

root@ceph1:~# sgdisk -i 1 /dev/vdd
Partition GUID code: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D (Unknown)
Partition unique GUID: C7EB237F-9A8F-4938-B010-125B3D6D0D4A
First sector: 2048 (at 1024.0 KiB)
Last sector: 41943006 (at 20.0 GiB)
Partition size: 41940959 sectors (20.0 GiB)
Attribute flags: 0000000000000000
Partition name: ''

修改分区名

root@ceph1:~$ sgdisk --help | grep change-name
  -c, --change-name=partnum:name             change partition's name

-c 修改某个分区的分区名

• 指定第一分区的分区名：

root@ceph1:~# sgdisk  -c 1:"ceph data" /dev/vdd
The operation has completed successfully.

root@ceph1:~# sgdisk -i 1 /dev/vdd
Partition GUID code: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D (Unknown)
Partition unique GUID: C7EB237F-9A8F-4938-B010-125B3D6D0D4A
First sector: 2048 (at 1024.0 KiB)
Last sector: 41943006 (at 20.0 GiB)
Partition size: 41940959 sectors (20.0 GiB)
Attribute flags: 0000000000000000
Partition name: 'ceph data'

清除分区数据

root@ceph1:~$ sgdisk --help | grep zap
  -z, --zap                  zap (destroy) GPT (but not MBR) data structures

• 清除第一分区：

root@ceph1:~# sgdisk -z /dev/vdd1
Creating new GPT entries.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.

删除分区

root@ceph1:~$ sgdisk --help | grep delete
  -d, --delete=partnum                 delete a partition

-d 删除一个分区

• 删除第一分区：

root@ceph1:~# sgdisk -d 1 /dev/vdd
The operation has completed successfully.

root@ceph1:~# lsblk | grep vdd
NAME   MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vdd    253:48   0  40G  0 disk
└─vdd2 253:50   0  5G   0 part