It would be nice if there was an easy way to tell btrfs to allocate
another metadata chunk. For example, the below fs is full due to
exhausted metadata:
Device size: 1013.28GiB
Device allocated: 1013.28GiB
Device unallocated: 2.00MiB
Device missing: 0.00B
Used: 981.94GiB
Free (estimated): 15.16GiB (min: 15.16GiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 510.31MiB (used: 0.00B)
Data Metadata System
Id Path RAID1 RAID1 RAID1 Unallocated
-- --------- --------- --------- -------- -----------
1 /dev/sdv1 505.63GiB 1.00GiB 8.00MiB 1.00MiB
2 /dev/sdw1 505.63GiB 1.00GiB 8.00MiB 1.00MiB
-- --------- --------- --------- -------- -----------
Total 505.63GiB 1.00GiB 8.00MiB 2.00MiB
Used 490.47GiB 510.88MiB 96.00KiB
I can delete a multi GB file and get several GB of unallocated space,
however if I try and copy big files to it again the same exact thing
happens. However, if I play with balance and deleting files and such
and manage to get it to allocate another metadata chunk while there is
unallocated space then the filesystem will happily fill up all of the
data chunks. Failing an automatic allocation out of global reserve, or
saving metadata as soon as unallocated space is available it would be
nice if I could just delete a file and then tell btrfs to allocate
more metadata immediately. Makes sense? No idea how easy this would be
to do, but seems like it should be a simple thing btrfs file could do.
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