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解决:Linux误删磁盘分区通过testdisk恢复分区方法
被墙跳转TG:@qianhenetwork QQ 851617266

来源： 2020-09-01 23:03:49 Linux 163 0

前言：之前在linux操作磁盘时不小心将数据盘的分区误删了,吓得一身汗,因为里面有很多数据,价值500w,一顿折腾,最终通过testdisk恢复了分区,数据也找回来了,本教程将之前的操作方法整理一下,希望对大家有帮助,方法很简单。
有丢失数据的风险,操作前请务必做好快照或备份。
情景再现：
删除分区后磁盘挂载报错：

[[email protected] mnt]# mount /dev/vdb1 /mnt
mount: /dev/vdb1 is already mounted or /mnt busy
/dev/vdb1 is already mounted on /mnt

或

[[email protected]~]# mount /dev/vdb1 /mnt
mount: special device /dev/vdb1 does not exist

注意：报上面错误不一定都是删除了磁盘分区的原因，具体需根据情况操作,如果您对数据盘分区做过调整,刚好也报上面的错误,则可能是磁盘分区的原因。
操作前请务必做好快照或备份。
解决方法：
1、安装testdisk。
centos系统：

yum -y install testdisk

乌班图：

sudo apt-get install testdisk sudo apt-get install testdisk

2、运行testfdisk恢复分区（将/dev/vdb更换为您自己的磁盘分区）

testdisk /dev/vdb

显示如下：

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

TestDisk is free software, and
comes with ABSOLUTELY NO WARRANTY.

Select a media (use Arrow keys, then press Enter):
>Disk /dev/vdb - 21 GB / 20 GiB

>[Proceed ] [ Quit ]

Note: Disk capacity must be correctly detected for a successful recovery.
If a disk listed above has an incorrect size, check HD jumper settings and BIOS
detection, and install the latest OS patches and disk drivers.

如图

选择“Proceed”回车,进入如下界面：

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org
Disk /dev/vdb - 21 GB / 20 GiB

Please select the partition table type, press Enter when done.Hint: Intel partition table type has been detected.Note: D
>[Intel ] Intel/PC partition 说明：磁盘分区是mbr则选这个。
[EFI GPT] EFI GPT partition map (Mac i386, some x86_64...) 说明：磁盘分区是gpt则选这个。
[Humax ] Humax partition table
[Mac    ] Apple partition map (legacy)
[None   ] Non partitioned media
[Sun    ] Sun Solaris partition
[XBox   ] XBox partition
[Return ] Return to disk selection

选择分区表类型进行扫描：一般选择Intel（默认）。如果您的数据盘采用GPT分区，选择EFI GPT。
我的磁盘分区是GPT,所以我选择第二个,上下键选择后按回车出现如下：

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/vdb - 21 GB / 20 GiB
CHS 41610 16 63 - sector size=512Note: Correct disk geometry is required for a successful recovery. 'Analyse'process may give some warnings if it thinks the logical geometry is mismatched.
>[ Analyse ] Analyse current partition structure and search for lost partitions
[ Advanced ] Filesystem Utils
[ Geometry ] Change disk geometry
[ Options ] Modify options
[ Quit ] Return to disk selection

选择“Analyse”后按回车键。后显示如下

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/vdb - 21 GB / 20 GiB - CHS 41610 16 63
Current partition structure:
     Partition                  Start        End    Size in sectors

Trying alternate GPT

                P=Primary D=Deleted
>[Quick Search]
                            Try to locate partition

结果看是没有任何分区的,选择“Quick Search”后按回车键搜索一下分区。
搜索后稍等片刻会显示如下信息,具体等待时间长短与您磁盘容量有关系。

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/vdb - 21 GB / 20 GiB - CHS 41610 16 63
     Partition               Start        End    Size in sectors
>P Linux filesys. data         2048   39847935   39845888

Structure: Ok. Use Up/Down Arrow keys to select partition.
Use Left/Right Arrow keys to CHANGE partition characteristics:
                P=Primary D=Deleted
Keys A: add partition, L: load backup, T: change type, P: list files,
     Enter: to continue
ext4 blocksize=4096 Large_file Sparse_SB Recover, 20 GB / 19 GiB

选中分区后，按回车键.然后用方向键移动选择“Write”即可保存分区。

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/vdb - 21 GB / 20 GiB - CHS 41610 16 63
     Partition                  Start        End    Size in sectors
1 P Linux filesys. data         2048   39847935   39845888
[ Quit ] [ Return ] [Deeper Search] >[ Write ]
                       Write partition structure to disk

然后提示如下,输入y保存

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Write partition table, confirm ? (Y/N)y

如果提示：“You will have to reboot for the change to take effect.”则需要重启服务器后执行如下命令。
退出testfdisk（ctrl+c）然后执行如下命令,如果没任提示,则表示正常。