Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Add 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

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/mpath<y>p<y>
Where <y> 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<y>-part<y>
Where <y> is letters 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<y>_part<y>
Where <y> is one or more letters 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.

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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Add new partition to Device Mapper