Re: from 2x RAID1 to 1x RAID6 ?

["Stefan G. Weichinger" <lists@xunil.at>]

Am 08.06.2011 03:16, schrieb John Robinson:

> There may be a clever alternative, retaining single redundancy, if
> you don't mind buying one more disc, which I'm guessing you might do
> soon anyway as you're already 85% full. Or if not, it won't do too
> much harm to have a spare drive sitting on a shelf.

In fact I already have one ... but I can't use it as the 8 bays of that
server are already fully used. I could only attach that drive
temporarily with USB or so ...

> You can convert a 2-drive RAID1 to a 2-drive RAID5, then add the new 
> drive to double the size of the array, resize the PV, then move the
> PEs over from the other RAID1, then tear down that PV and RAID1, add
> one or both of those drives into the RAID5 and grow it to a RAID6.
> The only step at which you have a little less redundancy is while
> you're running the 3-drive RAID5 (well, it's still 1 drive but
> against 2 drives, instead of 1:1).

Clever idea, yes ... but a rather long way somehow ...

> On the other hand it might be easier to take a backup, which you 
> probably ought to do anyway!

Yep, I assume it will be that way: mv data aside, new array, data back
in ...

Thanks anyway, Stefan