[CentOS7]硬盘扩容无法发现扩容容量

1. 扩容sdc

[root@DB2 ~]# lsblk 
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdc               8:32   0  200G  0 disk 
└─sdc1            8:33   0  200G  0 part 
  └─centos-root 253:0    0  1.2T  0 lvm  /

2. 触发扫描

echo '1' > /sys/class/scsi_disk/0\:0\:2\:0/device/rescan 

[root@DB2 ~]# lsblk 
sdc               8:32   0  400G  0 disk 
└─sdc1            8:33   0  200G  0 part 
  └─centos-root 253:0    0  1.2T  0 lvm  /

3. 添加硬盘无法识别

[root@DB2 ~]# ls /sys/class/scsi_host
host0 host1 

4. 重新扫描

echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -" > /sys/class/scsi_host/host1/scan

END