Scanning for New Partitioned Devices without Rebooting

Use the example in this section to detect a newly added multipathed LUN without rebooting.

Detect the newly added multipathed LUN by entering:

echo '- - -' >>/sys/class/fc_host/host1/device/scsi_host/host1/scan

echo '- - -' >>/sys/class/fc_host/host2/device/scsi_host/host2/scan

Verify that the device is seen (link has a fresh timestamp) by entering
```
ls -lrt /dev/dm-*
```
Verify the new WWN of the device appears in the log by entering
```
tail -33 /var/log/messages
```
Use a text editor to add a new alias definition for the device in the /etc/multipath.conf file, such as oradata3.
Create a partition table for the device by entering
```
fdisk /dev/dm-8
```
Trigger udev by entering
```
echo 'add' > /sys/block/dm-8/uevent
```
This generates the device-mapper devices for the partitions on dm-8.
Create a filesystem and label for the new partition by entering
```
mke2fs -j /dev/dm-9
```
```
tune2fs -L oradata3 /dev/dm-9
```
Restart DM-Multipath to let it read the aliases by entering
```
/etc/init.d/multipathd restart
```
Verify that the device is recognized by multipathd by entering
```
multipath -ll
```
Use a text editor to add a mount entry in the /etc/fstab file.
At this point, the alias you created in Step 5 is not yet in the /dev/disk/by-label directory. Add the mount entry the /dev/dm-9 path, then change the entry before the next time you reboot to
```
LABEL=oradata3
```
Create a directory to use as the mount point, then mount the device by entering
```
md /oradata3
```
```
mount /oradata3
```