轉載自：https://blog.51cto.com/1012682/2360215
實驗環境 一臺運行Centos 7的虛擬機在線添加一塊4G硬盤
[關鍵命令]
添加：
echo "scsi add-single-device 1 2 3 4" >/proc/scsi/scsi
移除：
echo "scsi remove-single-device 1 2 3 4" > /proc/scsi/scsi
命令行解釋：
命令行中的 1 2 3 4 需要自行修改成相應的參數：
1 : SCSI HBA ID
2 : SCSI Channel
3 : SCSI ID
4 : LUN ID
添加也可以使用 echo "- - -" > /sys/class/scsi_host/host2/scan
'- - -'代表channel，target和LUN編號。以上命令會導致host2下所有channel，target以及可見LUN被掃描
通過 lsscsi 命令可以查看對應參數
[root@localhost ~]# lsscsi
[1:0:0:0] cd/dvd NECVMWar VMware IDE CDR10 1.00 /dev/sr0
[2:0:0:0] disk VMware, VMware Virtual S 1.0 /dev/sda
[root@localhost ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: VMware, Model: VMware Virtual S Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: NECVMWar Model: VMware IDE CDR10 Rev: 1.00
Type: CD-ROM ANSI SCSI revision: 05
[root@localhost ~]# ls /sys/class/scsi_host/
host0 host1 host2
#可以看到scsi硬盤使用的總線是host2
[root@localhost ~]# echo "- - -" > /sys/class/scsi_host/host2/scan
[root@localhost ~]# lsscsi
[1:0:0:0] cd/dvd NECVMWar VMware IDE CDR10 1.00 /dev/sr0
[2:0:0:0] disk VMware, VMware Virtual S 1.0 /dev/sda
[2:0:1:0] disk VMware, VMware Virtual S 1.0 /dev/sdb
#或者使用 echo "scsi add-single-device 2 0 1 0" >/proc/scsi/scsi 也可以發現設備
[root@localhost ~]# lsblk /dev/sdb
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 4G 0 disk
[root@localhost ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: VMware, Model: VMware Virtual S Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: NECVMWar Model: VMware IDE CDR10 Rev: 1.00
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 01 Lun: 00
Vendor: VMware, Model: VMware Virtual S Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
現在移除添加的硬盤
[root@localhost ~]# echo "scsi remove-single-device 2 0 1 0 " > /proc/scsi/scsi
[root@localhost ~]# lsscsi
[1:0:0:0] cd/dvd NECVMWar VMware IDE CDR10 1.00 /dev/sr0
[2:0:0:0] disk VMware, VMware Virtual S 1.0 /dev/sda
[root@localhost ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: VMware, Model: VMware Virtual S Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: NECVMWar Model: VMware IDE CDR10 Rev: 1.00
Type: CD-ROM ANSI SCSI revision: 05
[root@localhost host2]# ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3