Re: mdadm -> BTRFS conversion

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On Wed, 2021-03-31 at 21:17 +0800, Ed Greshko wrote:
> On 31/03/2021 19:49, Patrick O'Callaghan wrote:
> > I currently have a pair of external drives configured as ext4 with
> > RAID1 using mdadm, and mainly used for backup. My / and /home
> > filesystems are now BTRFS so I'm looking at converting the external
> > drives to BTRFS with RAID1. My main reason is to take advantage of
> > BTRFS checksumming as a guard against bitrot, but I'd also like the
> > flexibility of setting up subvolumes with different properties (the
> > disks are currently 90% empty).
> > 
> > Any thoughts on this? What would be the simplest conversion
> > strategy if
> > I go ahead?
> 
> Just a thought....  If the drives are 90% empty and used mainly for
> backup and there
> is sufficient space on the local storage for the remainder I'd take
> the path of least resistance.
> 
> I'd copy the "non-backedup" stuff to local storage and then blow the
> rest away and
> create the raid/btrfs volumes from scratch.  After that is done, move
> the stuff back
> and do a backup.  I'm lazy.  And if possible, I'd rather not do
> something I'm unlikely to
> have to do again in the future.  :-) :-)

Yes, pretty much what I had in mind.

poc
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