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btrfs-progs: docs: add section about multiple profiles

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Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Signed-off-by: David Sterba <dsterba@suse.com>
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Goffredo Baroncelli 2020-04-04 12:32:12 +02:00 committed by David Sterba
parent 843b3c7bdc
commit 24dcafc491
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Documentation/btrfs-man5.asciidoc
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@ -846,6 +846,37 @@ work and a workaround would need to be used to mount a multi-device filesystem.
The mount option 'device' can trigger the device scanning during mount.
FILESYSTEM WITH MULTIPLE PROFILES
---------------------------------
It is possible that a btrfs filesystem features block group of the same
type (e.g. data) with different profiles.
This could happen when a profile conversion is interrupted (see
`btrfs-balance(8)`).
Some 'btrfs' commands perform a test to detect this kind of condition. In such
case a warning like this is showed:
--------------------
WARNING: Multiple profiles detected. See 'man btrfs(5)'.
WARNING: data -> [raid1, single], metadata -> [raid1, single]
--------------------
In a case like this, it is suggested to complete the conversion running
`btrfs balance`. This because the next block group allocation
is performed on the basis of the set of the profiles present on the disks,
according to the following priorities:
* RAID6
* RAID5
* RAID10
* RAID1
* RAID0
For example if both the profile RAID6 and RAID1 are present on the disks,
the next block group allocation will be RAID6, regardeless of the last
`btrfs balance`.
SEE ALSO
--------
`acl`(5),