Was ist mdadm:
mdadm is a tool for creating, managing and monitoring
device arrays using the "md" driver in Linux, also
known as Software RAID arrays.

Verfügbar unter: http://www.de.kernel.org/pub/linux/utils/raid/mdadm/

Änderungsinfos laut Neil:
Release 1.9.0 adds:
- Fix rpm build problem (stray %)
- Minor manpage updates
- Change "dirty" status to "active" as it was confusing people.
- --assemble --auto recognises 'standard' name and insists on using
the appropriate major/minor number for them.
- Remove underscore from partition names, so partitions of
"foo" are "foo1", "foo2" etc (unchanged) and partitions of
"f00" are "f00p1", "f00p2" etc rather than "f00_p1"...
- Use "major", "minor", "makedev" macros instead of
"MAJOR", "MINOR", "MKDEV" so that large device numbers work
on 2.6 (providing you have glibc 2.3.3 or later).
- Add some missing closes of open file descriptors.
- Reread /proc/partition for every array assembled when using
it to find devices, rather than only once.
- Make "mdadm -Ss" stop stacked devices properly, by reversing the
order in which arrays are stopped.
- Improve some error messages.
- Allow device name to appear before first option, so e.g.
mdadm /dev/md0 -A /dev/sd[ab]
works.
- Assume '-Q' if just a device is given, rather than being silent.

This is based on 1.8.0 and *not* on 1.8.1 which was meant to be a pre-release for the upcoming 2.0.0.