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daq OP ,

Are you sure that’s the case with btrfs? I know ext has that feature. My understanding is btrfs just has a global reserve that can be used for any data in an low space situation.


<span style="color:#323232;"># sudo btrfs fi usage /mnt/disk3
</span><span style="color:#323232;">Overall:
</span><span style="color:#323232;">    Device size:                  12.73TiB
</span><span style="color:#323232;">    Device allocated:             12.73TiB
</span><span style="color:#323232;">    Device unallocated:            1.00MiB
</span><span style="color:#323232;">    Device missing:                  0.00B
</span><span style="color:#323232;">    Device slack:                    0.00B
</span><span style="color:#323232;">    Used:                         12.29TiB
</span><span style="color:#323232;">    Free (estimated):            449.43GiB      (min: 449.43GiB)
</span><span style="color:#323232;">    Free (statfs, df):           449.43GiB
</span><span style="color:#323232;">    Data ratio:                       1.00
</span><span style="color:#323232;">    Metadata ratio:                   2.00
</span><span style="color:#323232;">    Global reserve:              512.00MiB      (used: 0.00B)
</span><span style="color:#323232;">    Multiple profiles:                  no
</span><span style="color:#323232;">
</span><span style="color:#323232;">Data,single: Size:12.70TiB, Used:12.26TiB (96.55%)
</span><span style="color:#323232;">   /dev/sdd1      12.70TiB
</span><span style="color:#323232;">
</span><span style="color:#323232;">Metadata,DUP: Size:15.00GiB, Used:14.49GiB (96.58%)
</span><span style="color:#323232;">   /dev/sdd1      30.00GiB
</span><span style="color:#323232;">
</span><span style="color:#323232;">System,DUP: Size:8.00MiB, Used:1.34MiB (16.80%)
</span><span style="color:#323232;">   /dev/sdd1      16.00MiB
</span><span style="color:#323232;">
</span><span style="color:#323232;">Unallocated:
</span><span style="color:#323232;">   /dev/sdd1       1.00MiB
</span>
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