The Linux Host sees LUNs on the storage system as SCSI devices. When you have multiple LUNs, you must be able to persistently identify each LUN across system reboots. This means you should make sure each LUN has a unique file system label and then mount the file system using that label.
When you use multipathing, DM-Multipath automatically creates persistent devices for each LUN in the /dev/mapper/ directory on the Linux host.
|If you are running ...||Enter the following line ...|
|DM-Multipath with Red Hat Enterprise Linux||device mount_point type _netdev,defaults 0 0|
|DM-Multipath with SUSE Linux Enterprise Server||device mount_point type _netdev,defaults nofail,rw 0 0|
device is the name of the device in the /dev/mapper/ directory. You can create a file system directly on a multipath device in /dev/mapper/. You do not have to create a partition or label on the multipath device.
mount_point is the mount point you created for the file system.
type is the file system type, such as ext2 or ext3.
_netdev is used for any network-dependent devices such as iSCSI. It is only used in iSCSI environments and lets you add iSCSI mount point devices to /etc/fstab.