I think this is caused by poorly balanced disks. I.e:
nmdbio:~ % sudo btrfs fi show /dev/sdb
Label: 'scratch' uuid: 184706ea-89f5-438a-a9f5-b5e91b3ce267
Total devices 3 FS bytes used 7.57TB
devid 3 size 2.73TB used 2.45TB path /dev/sdc
devid 2 size 2.73TB used 2.73TB path /dev/sdb
devid 1 size 2.73TB used 2.73TB path /dev/sda
Btrfs v0.20-rc1
Note that two disks are entirely filled up, and only one has free space.
If I were to venture a guess, btrfs struggles to shuffle data about in
order to write multiple copies of metadata to each spindle.
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https://bugs.launchpad.net/bugs/791992
Title:
btrfs in 2.6.38 extremely slow (when near full?)
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