What to do if the Linux hard disk cannot be recognized

The solution to the problem that the Linux hard disk cannot be recognized: 1. Check the hard disk; 2. Check the host directory of the current system; 3. Add "- - -" to the file scan in the host directory; 4. Execute the shell with one click Just script.

The operating environment of this article: linux5.9.8 system, DELL G3 computer

What should I do if the Linux hard disk cannot be recognized?

Linux solution to add a new hard disk that cannot be recognized [no need to restart]

1. Check the hard disk

[root@linux-host1 ~]# lsblk 
NAME            MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda               8:0    0  20G  0 disk 
├─sda1            8:1    0   1G  0 part /boot
└─sda2            8:2    0  19G  0 part 
  ├─centos-root 253:0    0  17G  0 lvm  /
  └─centos-swap 253:1    0   2G  0 lvm  [SWAP]
sr0              11:0    1   1G  0 rom 
# 没有检查到sdb的硬盘

2. Check how many host directories there are in the current system

[root@linux-host1 ~]# ls /sys/class/scsi_host/ -l
total 0
lrwxrwxrwx. 1 root root 0 Sep 16 12:42 host0 -> ../../devices/pci0000:00/0000:00:10.0/host0/scsi_host/host0
lrwxrwxrwx. 1 root root 0 Sep 16 12:42 host1 -> ../../devices/pci0000:00/0000:00:07.1/ata1/host1/scsi_host/host1
lrwxrwxrwx. 1 root root 0 Sep 16 12:42 host2 -> ../../devices/pci0000:00/0000:00:07.1/ata2/host2/scsi_host/host2

3. Add "- - -" to the file scan in the host directory as many as there are

[root@linux-host1 ~]# echo "- - -"> /sys/class/scsi_host/host0/scan    
[root@linux-host1 ~]# echo "- - -"> /sys/class/scsi_host/host1/scan  
[root@linux-host1 ~]# echo "- - -"> /sys/class/scsi_host/host2/scan

4. Check again whether the hard disk has been recognized

[root@linux-host1 ~]# lsblk 
NAME            MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda               8:0    0  20G  0 disk 
├─sda1            8:1    0   1G  0 part /boot
└─sda2            8:2    0  19G  0 part 
  ├─centos-root 253:0    0  17G  0 lvm  /
  └─centos-swap 253:1    0   2G  0 lvm  [SWAP]
sdb               8:16   0  20G  0 disk <<已经识别成功
sr0              11:0    1   1G  0 rom

5. One-click Executed shell script

#!/bin/bash
scsisum=`ls -l /sys/class/scsi_host/host*|wc -l`
for ((i=0;i<${scsisum};i++))
do
   echo "- - -" > /sys/class/scsi_host/host${i}/scan
done

Recommended study: "linux video tutorial"

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