Linux 添加新硬盤無法識別[無需重啟]的解決方法

1、查看硬盤

[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 
# 沒有檢查到sdb的硬盤

2、查看當前系統有多少個host目錄

[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、有多少個host就往多少個host目錄里面文件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、再次檢查硬盤是否已經識別到

[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 <<已經識別成功
sr0              11:0    1   1G  0 rom  

5、一鍵執行的shell腳本

#!/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