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190 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<x> is the device
node on which the partition was created.
# kpartx –a /dev/mapper/mpath<x>
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
Below are some examples of the general mapping formats:
On Red Hat Enterprise Linux (RHEL) hosts, a partition node has the format:
/dev/mapper/mpath<x>p<y>
Where <x> is the alphabetic number for the multipathing device, <y> 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<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 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.
book.book Page 190 Thursday, December 9, 2010 3:20 PM