Dell POWERVAULT MD3620I - Manual (Page 202)

200 Configuration: Device Mapper Multipath for Linux
Add a New Partition to Device Mapper
The kpartx command adds the new fdisk partition to the Device Mapper
list of usable partitions. See examples below, where mpath is the device
node on which the partition was created.
# kpartx –a /dev/mapper/mpath
If successful, the command does not display an output. To verify success and
view exact partition naming, you can use these commands to see the full
partition names assigned.
# cd /dev/mapper
# ls
The following are some examples of the general mapping formats:
On Red Hat Enterprise Linux (RHEL) hosts, a partition node has the format:
/dev/mapper/mpathp
Where is the alphabetic number for the multipathing device, is
the partition number for this device.
On SUSE Linux Enterprise Server (SLES) 11.x hosts, a partition node has the
format:
/dev/mapper/mpath-part
Where is letter(s) assigned to the multipathing device and is the
partition number.
On SLES 10.3 hosts, a partition node has the format:
/dev/mapper/mpath_part
Where is the letter(s) assigned to the multipathing device and is
the partition number.
NOTE: After creating a partition on a device capable of multipathing, 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.
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