[GLLUG] Link two RAIDs in one LVM?

[James Roberts]

On 10/05/2020 21:35, Andy Smith via GLLUG wrote:
> Hello,
> 
> On Sun, May 10, 2020 at 10:03:32PM +0200, Dr. Axel Stammler via GLLUG wrote:
>> On Sun 2020-05-10 08.53.16, James Courtier-Dutton wrote:
>>> So, I think moving to an "LVM mirror" solution is your best bet for
>>> future extensibility.

I haven't reviewed all the recent replies, but is there any reason why 
you can't add the the two new disks of the same size and migrate from 
RAID 1 to RAID 10, e.g:

https://blog.voina.org/convert-an-existing-2-disk-raid-1-to-a-4-disk-raid-10/

(though that has LVM on top, shouldn't make a difference in these 
circumstances, just a quick search, there's many other references, YMMV)

RAID 10 slightly enhances failure resistance, increases read speeds and 
keeps it simple. Although with two old disks, whatever you do, they will 
likely fail first.

The only thing I'd emphasise is whatever you do, if you care about the 
data you MUST have a backup first! (though in crisis hero mode I have 
been known to ignore my own advice, that's only on my OWN data...)

MeJ

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