On Wed, Dec 18, 2013 at 11:54:39PM +0900, Tomasz Chmielewski wrote: > On Wed, 18 Dec 2013 12:46:52 +0000 > Hugo Mills <h...@carfax.org.uk> wrote: > > > > # btrfs fi df /home > > > Data, RAID1: total=2.51TiB, used=1.58TiB > > > System, RAID1: total=32.00MiB, used=372.00KiB > > > Metadata, RAID1: total=48.00GiB, used=47.23GiB > > > # btrfs fi balance start -dusage=5 /home > > > Currently, yes, it is the only approach. > > Hope the above helps, > > So the balance finished, and metadata is still almost full: > > # btrfs fi df /home > Data, RAID1: total=1.60TiB, used=1.58TiB > System, RAID1: total=32.00MiB, used=248.00KiB > Metadata, RAID1: total=49.00GiB, used=47.24GiB > > Confused about the output - does it actually look any better?
Yes, because... > # btrfs fi show /home > Label: crawler-btrfs uuid: 60f1759c-45f6-4484-9f60-66a4e9bbf2b6 > Total devices 2 FS bytes used 1.63TiB > devid 3 size 2.56TiB used 1.66TiB path /dev/sdb4 > devid 4 size 2.56TiB used 1.66TiB path /dev/sda4 ... you have unallocated space here, so the FS can now allocate more metadata as it needs to. > Does it mean that data/system/metadata will be able to grow now, > until their size in total in 2.56TiB? Yes. Although note that where btrfs fi df reports space, that's _usable_ space (i.e. how much data you can fit in it), but where btrfs fi show reports space, it's disk bytes (i.e. how much of the disk has useful content on it). With RAID-1, the first figure is half the second figure. In your case, that's simple, but with different RAID levels for data and metadata the calculation becomes a little bit more complicated. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- What part of "gestalt" don't you understand? ---
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