User's Manual

Software installation 24
IMPORTANT: For example, if the array consists of two devices, the command output will not
display three lines in the mdadm.conf file–
one line for the array, and a line for each device.
Ensure that those lines are added to the mdadm.conf file so it matches the output of the
command.
For more details, see the mdadm and mdadm.conf manpages for your distribution. With these
changes, on most systems the RAID 0 array will be created automatically upon restart.
6. If you cannot access /dev/md0 after restart, run the following command:
$ mdadm --assemble --scan
You might also want to disable udev loading of the IO Accelerator driver, if needed, and then use the
init script provided for driver loading. For more information, see "Using the Init Script (on page 19)."
Making an array persistent
NOTE: On some versions of Linux, the configuration file is located in the
/etc/mdadm/mdadm.conf
, not
/etc/mdadm.conf
directory.
Inspect /etc/mdadm.conf. If one or more lines declare the devices to inspect, be sure one of those lines
specifies "partitions" as an option by adding a new DEVICE line to the file specifying the "partitions" option:
DEVICE partitions
Add a device specifier for the fio ioMemory devices:
DEVICE /dev/fio*
To verify whether any updates are needed to /etc/mdadm.conf, issue the following command:
$ mdadm --detail --scan
Compare the output of this command to what currently exists in mdadm.conf and add any needed sections
to /etc/mdadm.conf.
IMPORTANT: For example, if the array consists of two devices, the command output will not
display three lines in the mdadm.conf file–
one line for the array, and a line for each device.
Ensure that those lines are added to the mdadm.conf file so it matches the output of the
command.
For more details, see the mdadm and mdadm.conf man pages for your distribution.
With these changes, the RAID 0 array will be created automatically upon restart on most systems. If you have
problems accessing /dev/md0 after restart, run the following command:
$ mdadm --assemble --scan
If needed, you can also disable udev loading of the IO Accelerator driver. To load the driver, use the init
script.
IMPORTANT: In SLES 11, to be sure these services are run on boot, you might have to run the
following commands:
• chkconfig boot.md on
•
chkconfig mdadmd on