Linux下GPT分区扩容

#查看分区是否是GPT
[root@master ~]# fdisk -lu

Disk /dev/vda: 64.4 GB, 64424509440 bytes, 125829120 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: 0x000c5246

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048    83886046    41941999+  83  Linux

Disk /dev/vdb: 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: 0x6d99bbf5

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048    83886079    41942016   83  Linux
# Disk label type 字段显示是dos，说明是MBR分区，需要将其修改为GPT分区

#当前分区已经挂载，且有数据
[root@master ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.8G     0  1.8G   0% /dev
tmpfs           1.8G     0  1.8G   0% /dev/shm
tmpfs           1.8G  636K  1.8G   1% /run
tmpfs           1.8G     0  1.8G   0% /sys/fs/cgroup
/dev/vda1        40G  6.5G   33G  17% /
tmpfs           365M     0  365M   0% /run/user/0
overlay          40G  6.5G   33G  17% /var/lib/docker/overlay2/d767eb758bc331212ea9654d5fd69a82a8745f6571c190c0c453614a73152b67/merged
/dev/vdb1        40G   49M   38G   1% /mnt
#卸载磁盘并删除分区
[root@master ~]# umount /dev/vdb1
[root@master ~]# fdisk /dev/vdb
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): d
Partition 1 is deleted

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
#转换为GPT
[root@master ~]# parted /dev/vdb
GNU Parted 3.1
Using /dev/vdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel gpt
Warning: The existing disk label on /dev/vdb will be destroyed and all data on
this disk will be lost. Do you want to continue?
Yes/No? y
(parted) mkpart primary 1 100%
(parted) align-check optimal 1
1 aligned
(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 42.9GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name     Flags
 1      1049kB  42.9GB  42.9GB  ext4         primary

(parted) quit
Information: You may need to update /etc/fstab.
[root@master ~]# blkid
/dev/vda1: UUID="a92951e2-d169-405d-8eb9-64983497ed65" TYPE="ext4"
/dev/vdb1: UUID="e46bb349-da83-4a7a-be05-e3a28b71bdcc" TYPE="ext4"
[root@master ~]# mkfs.ext4 /dev/vdb1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
2621440 inodes, 10485248 blocks
524262 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2157969408
320 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

[root@master ~]# mount /dev/vdb1 /mnt
[root@master ~]# ls /mnt
lost+found
[root@master ~]# umount /dev/vdb1

[root@master ~]# fdisk -lu

Disk /dev/vda: 64.4 GB, 64424509440 bytes, 125829120 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: 0x000c5246

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048    83886046    41941999+  83  Linux

Disk /dev/vdb: 64.4 GB, 64424509440 bytes, 125829120 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: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1               1    83886079    41943039+  ee  GPT
[root@master ~]# parted /dev/vdb
GNU Parted 3.1
Using /dev/vdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) rm 1
Error: The backup GPT table is not at the end of the disk, as it should be.
This might mean that another operating system believes the disk is smaller.
Fix, by moving the backup to the end (and removing the old backup)?
parted: invalid token: 1
Fix/Ignore/Cancel? F
Warning: Not all of the space available to /dev/vdb appears to be used, you can
fix the GPT to use all of the space (an extra 41943040 blocks) or continue with
the current setting?
Fix/Ignore? F
Partition number? 1
(parted) mkpart primary 1 100%
(parted) align-check optimal 1
1 aligned
(parted) quit
Information: You may need to update /etc/fstab.

[root@master ~]# mount /dev/vdb1 /mnt
[root@master ~]# resize2fs /dev/vdb1
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/vdb1 is mounted on /mnt; on-line resizing required
old_desc_blocks = 5, new_desc_blocks = 8
The filesystem on /dev/vdb1 is now 15728128 blocks long.
[root@master ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
devtmpfs       devtmpfs  1.8G     0  1.8G   0% /dev
tmpfs          tmpfs     1.8G     0  1.8G   0% /dev/shm
tmpfs          tmpfs     1.8G  540K  1.8G   1% /run
tmpfs          tmpfs     1.8G     0  1.8G   0% /sys/fs/cgroup
/dev/vda1      ext4       40G  6.5G   33G  17% /
tmpfs          tmpfs     365M     0  365M   0% /run/user/0
/dev/vdb1      ext4       59G   52M   57G   1% /mnt