Rescan the disks in Linux

root@mktgmysql3:/usr/local/mysql/data.bak# echo "- - -" > /sys/class/scsi_host/host2/scan
root@mktgmysql3:/usr/local/mysql/data.bak# lsscsi
[1:0:0:0]    cd/dvd  NECVMWar VMware IDE CDR10 1.00  /dev/sr0
[2:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sda
[2:0:1:0]    disk    VMware   Virtual disk     1.0   /dev/sdc
[4:0:0:0]    storage IET      Controller       0001  -
[4:0:0:154]  disk    REDUXIO  TCAS             23    /dev/sdb