On 2015-08-26 07:50, Roman Mamedov wrote:
On Wed, 26 Aug 2015 10:56:03 +0200
George Duffield <forumscollect...@gmail.com> wrote:

I'm looking to switch from a 5x3TB mdadm raid5 array to a Btrfs based
solution that will involve duplicating a data store on a second
machine for backup purposes (the machine is only powered up for
backups).

What do you want to achieve by switching? As Btrfs RAID5/6 is not safe yet, do
you also plan to migrate to RAID10, losing in storage efficiency?

Why not use Btrfs in single-device mode on top of your mdadm RAID5/6? Can even
migrate without moving any data if you currently use Ext4, as it can be
converted to Btrfs in-place.

As of right now, btrfs-convert does not work reliably or safely. I would strongly advise against using it unless you are trying to help get it working again.

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