linux虚拟机硬盘扩容/新加硬盘不识别

vm在线扩容已有磁盘不识别容量

echo 1 > /sys/block/sda/device/rescan
echo 1 > /sys/class/block/sda/device/rescan

刷新扫描scsi设备

ls /sys/class/scsi_host/
注意:有几个总线，就扫描几个
echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -" > /sys/class/scsi_host/host1/scan
echo "- - -" > /sys/class/scsi_host/host2/scan

脚本cat scsisum.sh

#!/usr/bin/bash
scsisum=`ll /sys/class/scsi_host/host*|wc -l`

for ((i=0;i<${scsisum};i++))
do
    echo "- - -" > /sys/class/scsi_host/host${i}/scan
done