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Customer data recovery

adminis5 years ago (2021-02-23)technology72590

If the customer's hard drive has a problem, or the operating system does not work, you can remove the hard drive and plug it into a installed CentOS, which is the name of the LVM volume group when installedDon't use the name VolGroup, because such a name often conflicts with the customer's default name.


After plugging in the hard drive, use lsblk to check the SDB of the customer's hard drive


[root@localhost ~]# lsblk 
NAME                        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdb                           8:0    0 465.8G  0 disk 
├─sdb1                        8:1    0   500M  0 part /boot
└─sdb2                        8:2    0 465.3G  0 part 
  ├─VolGroup-lv_root (dm-0) 253:0    0 461.3G  0 lvm  /

  └─VolGroup-lv_swap (dm-1) 253:1    0     4G  0 lvm  [SWAP]


Scan the vg volume group name, which is the default vg group name in CentOSVolGroup，Make sure that the group name of the machine does not duplicate it

vgscan


Activate the customer's LVM partition first, if the customer does not have LVM, this step does not need to be done.

vgchange -ay /dev/vg volume group name,


Here the case should be

vgchange -ay /dev/VolGroup


After creating a directory, you will put customer data on these two directories
mkdir /mnt/sdb1

mkdir /mnt/VolGroup-lv_root


Hang out the user's /boot partition

mount /dev/sdb1 /mnt/sdb1


Hang out the user's /partition

mount /dev/VolGroup/lv_root /mnt/VolGroup-lv_root


Examine:

df -TH

You should see /dev/sdb1 and /dev/VolGroup/lv_root

If you don't see it, it proves that the mount was not successful.


After the mounting is successful, continue with the following operations:


The user's /boot file is in the following directory:

/mnt/sdb1


Check if there are any files, and if not, it proves that the customer's kernel files have been deleted.

ll /mnt/sdb1


If there are files, look at the directory size

du -sh /mnt/sdb1


The user's/files are in the following directories:

/mnt/VolGroup-lv_root


Check the root directory of the original customer's hard drive to see if there are any files there

ll /mnt/VolGroup-lv_root


If there are files, look at the directory size

du -sh /mnt/VolGroup-lv_root


It is more common to repair two files
/mnt/VolGroup-lv_root/etc/fstab
/mnt/sdb1/grub/grub.conf
Both of these files are related to system boot


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