Root Partition is full then fine after reboot

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funglenn wrote:

Could it be some of the temp files for this 7 GB file were stuck somewhere or the system pre-allocated space for the files before they write written?

 

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The root file system on the x86 NAS is btrfs (like the data volume).  So it is possible that the file system became fully allocated.

You might want to do a btrfs fi df // and compare total with used.  The difference is the amount of partially allocated chunks.  Doing a balance of the root with btrfs balance start //can reduce that difference.  You'll get a warning about how long it might take, which you can ignore (the filesystem is small, so it won't really take very long).

Here's a sample from my RN526.  You'll see the balance freed up about 400 MB of allocated space (10% of the root partition).

# btrfs fi df //
Data, single: total=1.62GiB, used=986.55MiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=128.00MiB, used=12.41MiB
GlobalReserve, single: total=16.00MiB, used=0.00B
# btrfs balance start //
WARNING:

        Full balance without filters requested. This operation is very
        intense and takes potentially very long. It is recommended to
        use the balance filters to narrow down the scope of balance.
        Use 'btrfs balance start --full-balance' option to skip this
        warning. The operation will start in 10 seconds.
        Use Ctrl-C to stop it.
10 9 8 7 6 5 4 3 2 1
Starting balance without any filters.
Done, had to relocate 6 out of 6 chunks
# btrfs fi df //
Data, single: total=1.22GiB, used=986.76MiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=128.00MiB, used=12.53MiB
GlobalReserve, single: total=16.00MiB, used=0.00B

If you do run out of space during the balance, you can try again with filters (-dlimit and/or -dusage).