How do you expand a RAID5 Array?

[William O'Higgins Witteman]

On Mon, Aug 10, 2009 at 11:54:02AM -0400, Christopher Browne wrote:
>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.

I'm beginning to see that.  This is inherited hardware, and I am stuck
with RAID5 and no resizing.

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

Heavens no!  RAID is an alternative to single-point-of-failure HDs, not
backups.  Now the single-point-of-failure is the RAID controller :-)
Hopefully the RAID controller is solid state, and that is its saving
grace, but that doesn't prevent it from going pear-shaped and taking all
your disks with it.

The only replacement for backups is not caring about your data.
-- 

yours,

William

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