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186 Configuration: Device Mapper Multipath for Linux
Using DM Multipathing Devices
NOTE: Using or modifying any nodes other than the multipathing device nodes can
result in array or file system problems, including loss of communication with the
array and corruption of the file system. Avoid accessing any device other than the
multipathing device.
NOTE: After creating a partition on a multipathing device, 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.
Prerequisites
The following tasks must be completed before proceeding. For more
information about steps 1–3, see the MD3600i and MD3620i storage arrays
Deployment Guide. For more information about step 4, see "Creating Virtual
Disks" on page 110.
1
Install the host software from the MD3600i Series resource media
—
Insert the Resource media in the system to start the installation of
Modular Disk Storage Manager (MDSM) and Modular Disk
Configuration Utility (MDCU).
NOTE: Red Hat install of 5.
x
requires a remount of the DVD media to make
contents executable.
2
Reboot when prompted by the install program
—The installation program
prompts for and needs a reboot at completion of the installation.
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 MD3600i Series
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 MDSM
—After configuring the arrays
using the MDCU, run the MDSM to create and map virtual disks.
book.book Page 186 Thursday, December 9, 2010 3:20 PM