Device Mapper Configuration Steps; Scan For Newly Added Virtual Disks - Dell PowerVault MD3260i Administrator's Manual

3. Configure using MDCU — After the host server has rebooted, the MDCU automatically starts and is present on the
desktop. This utility allows for quick and easy configuration of new and or existing MD Series Dense storage arrays
present on your network. It also provides a GUI Wizard for establishing the iSCSI sessions to the array.
4. Create and map virtual disks using the MD Storage Manager — After configuring the arrays using the MDCU, run
the MD Storage Manager to create and map virtual disks.
Using The MD Storage Manager
Use the MD Storage Manager to:
• Map the host server to the MD Series Dense storage array
• Create the virtual disks
• Map newly created arrays to your host server
NOTE: Any arrays configured with MDCU automatically get added to the list of devices in the 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
2. Display the multipath device topology.
See Display The Multipath Device Topology Using The Multipath
3. Create a partition on a multipath device node.
See Create A New fdisk Partition On A Multipath Device
4. Add a partition to DM.
See Add A New Partition To Device
5. Create a file system on a DM partition.
See Create A File System On A Device Mapper
6. Mount a DM partition.
See Mount A Device Mapper
The following instructions show how to complete each of these steps.
In the following command descriptions, <x> is used to indicate where a substitution must be made. On Red Hat
Enterprise Linux systems, <x> is the number assigned to the device. On SUSE Linux Enterprise Server 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.
122
Disks.
Mapper.
Partition.
Partition.
Command.
Node.