I have just moved some partitions on two Linux (Mageia 3) boxes to btrfs
(call the boxes A and B). In both cases only a part of one physical disk
can be allocated to btrfs.
On box A, the btrfs partition size is 419 GB and the resulting usable
space is 418 GB with 1GB reserved by btrfs for metadata.
However, on box B, where the partition size is 388 GB, reserved metadata
amounts to 128 GB (!), leaving just 266 GB for data.
I've now done box B twice. Once using btrfs-convert and once by
reverting to ext4, and using KDE control centre to change the type of
the partition to btrfs, restoring the data from backups. In both cases
metadata reservation amount to 128 GB -- about 30% of the disk.
Any suggestions on (a) what the cause might be and (b) how to improve
things?
Thanks in advance,
--
Mike Arnautov
mailto:mla@xxxxxxxxxx
http://mipmip.org
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