Dell PowerVault MD3220 Owner's Manual page 172

On SLES 11.x hosts, a partition node has the format
/dev/mapper/mpath<x>-part<y>, where <x> is letter(s) assigned to the
multipathing device and <y> is the partition number.
On SLES 10.3 hosts, a partition node has the format
/dev/mapper/mpath<x>_part<y>, where <x> is the letter(s) assigned to
the multipathing device and <y> is the partition number.
NOTE:
After creating a partition on a multipathing device, all I/O operations,
including file system creation, raw I/O and file system I/O, must be done through the
partition node, and not through the multipathing device nodes.
Create a File System on a Device Mapper Partition
Use the standard mkfs command to create the file system on the newly
created Device Mapper partition
For example:
# mkfs –t <filesystem type> /dev/mapper/<partition
node>
where <partition node> is the partition on which the file system is created.
Mount a Device Mapper Partition
Use the standard mount command to mount the Device Mapper partition, as
shown below.
# mount /dev/mapper/<partition_node> <mounting_point>
Ready for Use
The newly created virtual disks created on the MD3200 Series array are now
setup and ready to be used. Future reboots automatically finds multipathing
devices along with their partitions.
Important Information About Special Partitions
When using Device Mapper with the MD3200 Series array, all physical disks
are assigned a disk device node. This includes a special device type used for
in-band management of the MD3200 Series array, known as the Access Disk
or Universal Xport device.
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Configuration: Device Mapper Multipath for Linux