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Article Reference

Article ID: 3656
Last update: 09-09-04
Issue:
What tools are available for Software RAID in Red Hat Enterprise Linux?
Resolution:
If you did not setup RAID during your system installation there are two tools you can use that will allow you to setup RAID array's post installation. These are mdadm and raidtools.

The main difference between the two tools is that raidtools requires a configuration file, /etc/raidtab, and mdadm does not. Althought there is a configuration file with mdadm to help you maintain your RAID array's, /etc/mdadm.conf, it is not neccessary for mdadm to operate.

Another difference is that raidtools is a set of tools (raidhotadd, raidhotremove, raidsetfaulty etc) to create and maintain your RAID where as mdadm is a single tool with multiple switches. Examples of each can be found below:

raidtools

mkraid /dev/md0
raidstart -a
raidhotadd <raid-device> <disk-partition>

For more information on how to implement RAID with raidtools:

mdadm

mdadm -C <dev> <level> <num devices> <devices>
mdadm -A -R /dev/md0
mdadm -a <raid-device> <device-partition>

For more information on how to implement RAID with mdadm:


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