Dell PowerVault MD3620i Owner's Manual - Page 190

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 Below 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. 190 Configuration: Device Mapper Multipath for Linux