假定在虛擬機當中添加了磁盤，但是虛擬機沒有識別出來；如何識別出來

可以使用命令

echo ‘- - -‘ >/sys/class/scsi_host/host0/scan

使用後就可以識別出來了

###增加兩塊硬盤 默認是不會識別

[root@compute1 ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x0009fb23

Device Boot Start End Blocks Id System

/dev/sda1 2048 4196351 2097152 82 Linux swap / Solaris

/dev/sda2 * 4196352 104857599 50330624 83 Linux

#scsi是內核參數

echo ‘- - -‘ >/sys/class/scsi_host/host0/scan

[root@compute1 ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x0009fb23

Device Boot Start End Blocks Id System

/dev/sda1 2048 4196351 2097152 82 Linux swap / Solaris

/dev/sda2 * 4196352 104857599 50330624 83 Linux

Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/sdc: 6442 MB, 6442450944 bytes, 12582912 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

openstack添加熱添加硬盤並識別