mbr分区的单独磁盘的备份恢复

Posted 2020-10-15

1.远程备份恢复

以centos6为例 先备份为mbr文件 拷贝到centos7 主机中（172.18.254.154）

[[email protected] ~]#dd if=/dev/sda of=mbr bs=1 count=512

[[email protected] ~]#scp mbr 172.18.254.154:/app/

 

* scp 远程主机与当前主机互传文件

命令格式：scp local_file [email protected]_ip:remote_folder

 scp /home/daisy/full.tar.gz [email protected]:/home/root

从远程复制到本地，只要将从本地复制到远程的命令的 后2个参数 调换顺序 即可；

 scp [email protected]:/home/root/others/music /home/space/music/1.mp3 

[[email protected] ~]# scp /etc/yum.repos.d/cdrom.repo [email protected]:/test

Are you sure you want to continue connecting (yes/no)?    输入yes或者no 不是y 或者n

[email protected]'s password: 登录密码

 

对centos6中磁盘清空bmr扇区 (分区表为0 计算机引导启动失效) 关机后系统已无法重新启动  

[[email protected] ~]#dd if=/dev/zero of=/dev/sda bs=1 count=512

512+0 records in

512+0 records out

512 bytes (512 B) copied, 0.000730352 s, 701 kB/s

[[email protected] ~]#fdisk -l /dev/sda

 

Disk /dev/sda: 214.7 GB, 214748364800 bytes

255 heads, 63 sectors/track, 26108 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

记住磁盘文件名并移除

 

 在centos7中 新加磁盘选取文件名  相当于centos6中拔出磁盘 重新插在centos7主机上

生成磁盘为sdc  将mbr恢复到sdc中

[[email protected] app]$dd if=mbr of=/dev/sdc

移除sdc  在centos6中重新添加磁盘文件名为centOS 64 位-000005.vmdk

启动centos6恢复正常

2.当前主机硬盘恢复     

适合当前主机磁盘数据发生更改 恢复到某一时期 分区磁盘sda未被破坏

[[email protected] test]#dd if=/dev/sda of=/dev/sdm bs=1 count=66 skip=446 seek=446 

[[email protected] app]$dd if=/dev/sda of=/dev/sdn   sdn分区大小大于sda分区大小

[[email protected] ~]#dd if=/dev/sda of=mbr bs=1 count=512