Thanks for the link Zak.
It states there: "Remark for Raid5/6: You will realize that (checking with
'df') the size of your array has not changed. If you added one 1TB drive to
your existing 3-1TB-drive-array mdadm will not automatically add the new 1TB of
space. Mdadm will just spread the old 3TB-array over 4 drives occupying 750GB
of each drive and leaving 250GB on each drive blank."
So mdadm will (automatically?) "spread" the data over the updated number of
drives. Just not extend the filesystem. I'll take that.
________________________________
From: Zak Elep <[email protected]>
To: Michael Tinsay <[email protected]>; Philippine Linux Users' Group (PLUG)
Technical Discussion List <[email protected]>
Sent: Monday, 13 May 2013, 10:47
Subject: Re: [plug] RAID 6 question
On Sat, May 11, 2013 at 11:14 AM, Michael Tinsay <[email protected]> wrote:
> I have a just-arrived, brand spanking new server to play with for the next
> few days or so. I'm toying with the idea of using RAID 6 on this for
> storage. I can put 4 disks right now on it during the setup and additional
> 2 disks later. My question is: when I add the 2 additional disk, is it
> standard for RAID 6 to redistribute data and parity across the 6 drives? I
> would want it to, I just want to know if this is automatic. If so, great.
> If not, I hope there's a simple way (a command or something) to initiate it.
I don't remember it being automatic. See the wiki.[0]
[0]: https://raid.wiki.kernel.org/index.php/Growing
--
Zak B. Elep || zakame.net
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