Kernel-3.10.0-957.el7_warm-plug-howto

IDE warm-plug HOWTO

To warm-plug devices on a port ‘idex’:

echo -n “1” > /sys/class/ide_port/idex/delete_devices

unplug old device(s) and plug new device(s)

echo -n “1” > /sys/class/ide_port/idex/scan

done

NOTE: please make sure that partitions are unmounted and that there are
no other active references to devices before doing “delete_devices” step,
also do not attempt “scan” step on devices currently in use – otherwise
results may be unpredictable and lead to data loss if you’re unlucky