Simple btrfs use case

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Hi

For example I have a bunch of various disks. I want to use them all as
one big storage:
mkfs.btrfs -m raid1 -d single /dev/sda /dev/sdb /dev/sdc ...
And someday one of my disks becomes dead. Disappears.
However, I can still mount fs in degraded,ro mode. All files that lays
on working disks are still available, but the only option to save
those files is to make a new fs on a new disk and copy them to it.
Why? Can I just drop files, whose chunks was on the dead disk?


How btrfs allocates files (file chunks) on physical disks? i.e. can I
lose all my files in -d single mode, when one of my disk becomes dead?
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