Btrfs in multiple different disc -d sigle -m raid1 one drive failure...

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Hi all,
I'm preparing a strorage pool for large data with quite low importance
- there will be at least 3 hdd in "-d single" and "-m raid1"
configuration.

mkfs.btrfs -d single -m raid1 /dev/sda /dev/sdb /dec/sdc

What happen if one hdd fails? Do I lost everything from all three
discs or only data from one disc? (if from only one disc, then is it
acceptable otherwise not...)

I read all documentation and a lot of discussions on the web and
answer is not clear at all...

Kind Regards

Jan.
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