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如何在 GNU/Linux 中移动分区？

tag-icon • tag-icon linux partitioning
如何在 GNU/Linux 中移动分区？

如何将分区稍微移到磁盘开头？Parted 出于某种原因（我不知道为什么）需要一个文件系统，我只想将所有扇区向左移动...

r@l:15:32:45:~# parted /dev/sdb
GNU Parted 2.3
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                                
Model: HGST HTS 541010A9E680 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  32.2GB  32.2GB  primary  fat32
 2      32.2GB  37.6GB  5360MB  primary
 3      37.6GB  1000GB  963GB   primary

(parted) move 3                                                           
WARNING: you are attempting to use parted to operate on (move) a file system.
parted's file system manipulation code is not as robust as what you'll find in
dedicated, file-system-specific packages like e2fsprogs.  We recommend
you use parted only to manipulate partition tables, whenever possible.
Support for performing most operations on most types of file systems
will be removed in an upcoming release.
Error: Could not detect file system.

答案1

sfdisk，旨在成为可编写脚本的 fdisk，自某个版本以来就有了这个--move-data选项。示例来自他们的手册页：

echo '+100M,' | sfdisk --move-data /dev/sdc -N 1

答案2

使用 dd 和 fdisk 的手动方式：

# fdisk -l /dev/sdb | grep sdb3
/dev/sdb3        73402368  1953525167   940061400   83  Linux

# fdisk /dev/sdb
Command (m for help): d
Partition number (1-4): 3
Command (m for help): n
Partition number (1-4, default 3): 3
First sector (73385984-1953525167, default 73385984): 
Using default value 73385984
Last sector, +sectors or +size{K,M,G} (73385984-1953525167, default 1953525167): 
Using default value 1953525167
Command (m for help): w
The partition table has been altered!

# fdisk -l /dev/sdb | grep sdb3
/dev/sdb3        73385984  1953525167   940069592   83  Linux

# dd conv=notrunc bs=512 iflag=fullblock if=/dev/sdb3 count=100 skip=$((73402368-73385984)) seek=0 2> /dev/null | file -s -
/dev/stdin: LUKS encrypted file, ver 1 [aes, cbc-essiv:sha256, sha1] UUID: af1c47f0-4ca5-4ea7-a091-065bd263653f

# dd conv=notrunc bs=512 iflag=fullblock if=/dev/sdb3  skip=$((73402368-73385984)) seek=0 of=/dev/sdb3

# file -s /dev/sdb3
/dev/sdb3: sticky LUKS encrypted file, ver 1 [aes, cbc-essiv:sha256, sha1] UUID: af1c47f0-4ca5-4ea7-a091-065bd263653f

现在等待大约 2 小时。（看起来更像是 18 小时......）

注意：这只会向后移动数据，而不是向前移动。

暂停：

# pidof dd
907
# kill -STOP 907
# cat /proc/907/fdinfo/1
pos:    586921398272
flags:  0100001

# kill -9 907

remember 586921398272/512 = 1146330856

继续：

dd conv=notrunc bs=512 iflag=fullblock if=/dev/sdb3  skip=$((1146330856+73402368-73385984)) seek=1146330856 of=/dev/sdb3

答案3

您可以随时使用dd。

  • 从 liveCD 启动（或任何其他确保分区未安装的方式）
  • dd if=/dev/sdc2 of=somefile bs=1M在文件上创建分区的副本。
  • fdisk（或任何你喜欢的）删除分区
  • fdisk（或任何你喜欢的命令）在你想要的位置创建分区。
  • dd of=/dev/sdc2 if=somefile bs=1M从文件恢复内容。

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