How do you expand a RAID5 Array?

[Christopher Browne]

On Mon, Aug 10, 2009 at 10:00 AM, William O'Higgins
Witteman<william.ohiggins-H217xnMUJC0sA/PxXw9srA at public.gmane.org> wrote:
> I have a server with three drives in a RAID5 configuration.  I have
> three more drives which I would like to add.  Do I just plug them in, or
> do I need to plug them in a reboot, or will it require a reinstall of
> the OS?

That seems *really* likely to depend heavily on your hardware choices.

Notably, if the RAID array is managed by the disk controller, as is
the case with the fancier sort of SATA controller, then this depends
*entirely* on how the controller works, and usually the answer will be
pretty negative (e.g. - "you'll need to redo the filesystem").

If you're using software RAID, then you should see:
http://tldp.org/HOWTO/Software-RAID-HOWTO-5.html#ss5.8

Some changes may be made, but you shouldn't pretend RAID is an
alternative to doing backups :-)
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