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While not described in this HOWTO, some useful tools for Software-RAID
systems have been developed.
It is not easy to add another disk to an existing array. A tool to
allow for just this operation has been developed, and is available
from
http://unthought.net/raidreconf. The tool will
allow for conversion between RAID levels, for example converting a
two-disk RAID-1 array into a four-disk RAID-5 array. It will also
allow for chunk-size conversion, and simple disk adding.
Please note that this tool is not really "production ready". It seems
to have worked well so far, but it is a rather time-consuming process
that, if it fails, will absolutely guarantee that your data will be
irrecoverably scattered over your disks. You absolutely
must keep good backups prior to experimenting with this
tool.
Remember, RAID is no substitute for good backups. No amount of
redundancy in your RAID configuration is going to let you recover week
or month old data, nor will a RAID survive fires, earthquakes, or
other disasters.
It is imperative that you protect your data, not just with RAID, but
with regular good backups. One excellent system for such
backups, is the
Amanda
backup system.
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