HP 3PAR SUSE Linux Enterprise Implementation Guide

2. Run the multipath command to recognize the devices for DM-MPIO configuration.

# multipath

3. Verify that the device is seen.

ls -ltr /dev/dm-*

(The link has a new time stamp)

4. Verify the new WWN of the device appears.

# tail /var/log/messages

5. Create a partition table for the device.

fdisk /dev/dm-<n>

parted /dev/dm-<n>

6. Trigger udev by

# echo 'add' > /sys/block/dm-<n>/uevent

7. Verify that the new partition is recognized by multipathd.

multipath -ll

If this method fails, proceed with the manual methods described below.

Discovering Devices with an Emulex HBA

There are several methods of dynamically adding new LUNs:

• Use rescan-scsi-bus.sh.

• Use the echo statement.

• Use the echo scsi add statement.

If the rescan-scsi-bus.sh method fails, HP recommends that you use the echo statement method,

where the scan is performed using the sys device tree.

Scan Methods for LUN Discovery

You can use the following methods to discover LUNs from the SUSE host.

• Method 1: Use sysfs scan for scanning multiple devices at once.

• Method 2: Use adding single devices for adding single devices one at a time.

• Method 3: Use the rescan-scsi-bus.sh script described in “Discovering Devices with an Emulex

HBA” (page 49).

Discovering Devices with an Emulex HBA 49