linux系统下硬盘无法识别怎么办(linux系统识别不了硬盘)

Linux 添加新硬盘无法识别[无需重启]的解决方法

1、查看硬盘

[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、查看当前系统有多少个host目录

[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、有多少个host就往多少个host目录里面文件scan追加"- - -"

[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、再次检查硬盘是否已经识别到

[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、一键执行的shell脚本

#!/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

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