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btrfs-progs: docs: add a note about RW degraded mount #1153

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btrfs-progs: docs: add a note about RW degraded mount #1153

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8 changes: 8 additions & 0 deletions Documentation/ch-mount-options.rst
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Expand Up @@ -180,6 +180,14 @@ degraded
then the constraint of single/data is not satisfied and the filesystem
cannot be mounted.

.. note::
During a degraded mount, if BTRFS is going to allocate a new chunk,
and the existing devices can not meet the requirement for the
current profile, BTRFS will fall back to other profiles like SINGLE.

It is recommended to check and balance chunks with unwanted profiles,
after an RW degraded mount.

.. duplabel:: mount-option-device

device=<devicepath>
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