Device Mapper Configuration Steps - Dell PowerVault MD3200i Owner's Manual

NOTE:
Any arrays configured with MDCU automatically adds to the list of Devices
in the PowerVault Modular Disk Storage Manager Enterprise Management Window
(EMW).

Device Mapper Configuration Steps

To complete the DM multipathing configuration and make storage available
to the Linux host server:
1 Scan for virtual disks. See "Scan for newly added Virtual Disks" on
page 179.
2 Display the multipath device topology. See "Display the multipath device
topology using the multipath command" on page 180.
3 Create a partition on a multipath device node. See "Create a New fdisk
Partition on a Multipath Device Node" on page 181.
4 Add a partition to DM. See "Add a new Partition to Device Mapper" on
page 181.
5 Create a file system on a DM partition. See "Create a file system on a
Device Mapper Partition" on page 182.
6 Mount a DM partition. See "Mount a Device Mapper Partition" on
page 182.
The following instructions show how to complete each of these steps.
In the following command descriptions <x> is used to indicate where a
substitution should be made. On Red Hat
is the number assigned to the device. On SUSE
systems <x> is the letter(s) assigned to the device.
Scan for newly added Virtual Disks
The rescan_dm_devs command scans the host server system looking for
existing and newly added virtual disks mapped to the host server.
# rescan_dm_devs
If an array virtual disk (VD) is mapped to the host server at a later time the
rescan_dm_devices command must be run again to make the VD a
visible LUN to the operating system.
®
Configuration: Device Mapper Multipath for Linux
Enterprise Linux
®
Linux Enterprise Server
®
systems <x>
179