Chapter 5. Managing Multipath I/O for Devices / 5.11. Scanning for New Partitioned Devices without Rebooting
	5.10. Scanning for New Devices without Rebooting		5.12. Using Multipathed Devices

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
```
Add a /dev/dm-* link for the new partition by entering
```
/sbin/kpartx -a -p -part /dev/dm-8
```
Verify that the link was created by entering
```
ls -lrt /dev/dm-*
```
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
```