On Sat, Mar 05, 2016 at 12:34:09PM -0700, Chris Murphy wrote: > I'd try to use -musage filter alone, in whatever increments work. So > try 0. Then 5. If 5 fails, try 2. Increment until size is not much > more than 2-3x used.
Here we go: [7/506]mh@fan:~$ sudo btrfs balance -usage=0 /media/tempdisk Done, had to relocate 32 out of 134 chunks [8/507]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.33GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [9/508]mh@fan:~$ sudo btrfs balance start -musage=0 /media/tempdisk Done, had to relocate 32 out of 134 chunks [10/509]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.33GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [11/510]mh@fan:~$ sudo btrfs balance start -musage=0 /media/tempdisk Done, had to relocate 36 out of 134 chunks [12/511]mh@fan:~$ sudo btrfs balance fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.33GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [13/512]mh@fan:~$ sudo btrfs balance start -musage=10 /media/tempdisk Done, had to relocate 41 out of 134 chunks [14/513]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [15/514]mh@fan:~$ sudo btrfs balance start -musage=20 /media/tempdisk Done, had to relocate 43 out of 134 chunks [16/515]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [17/516]mh@fan:~$ sudo btrfs balance start -musage=30 /media/tempdisk Done, had to relocate 48 out of 134 chunks real 0m48.604s user 0m0.008s sys 0m15.756s [18/517]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [19/518]mh@fan:~$ time sudo btrfs balance start -musage=40 /media/tempdisk Done, had to relocate 49 out of 134 chunks real 0m17.076s user 0m0.000s sys 0m5.188s [20/519]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [21/520]mh@fan:~$ time sudo btrfs balance start -musage=50 /media/tempdisk Done, had to relocate 49 out of 134 chunks real 0m11.536s user 0m0.004s sys 0m3.512s [22/521]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [23/522]mh@fan:~$ time sudo btrfs balance start -musage=60 /media/tempdisk Done, had to relocate 49 out of 134 chunks real 0m4.485s user 0m0.008s sys 0m0.664s [24/523]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [25/524]mh@fan:~$ time sudo btrfs balance start -musage=70 /media/tempdisk Done, had to relocate 50 out of 134 chunks real 0m16.581s user 0m0.012s sys 0m5.456s [26/525]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=26.50GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=3.33MiB [27/526]mh@fan:~$ time sudo btrfs balance start -musage=80 /media/tempdisk ERROR: error during balancing '/media/tempdisk': No space left on device There may be more info in syslog - try dmesg | tail real 0m16.775s user 0m0.004s sys 0m5.800s [28/527]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=26.50GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=33.69MiB [29/528]mh@fan:~$ time sudo btrfs balance start -musage=75 /media/tempdisk ERROR: error during balancing '/media/tempdisk': No space left on device There may be more info in syslog - try dmesg | tail real 0m4.363s user 0m0.004s sys 0m0.600s [30/529]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B [31/530]mh@fan:~$ time sudo btrfs balance start -musage=74 /media/tempdisk Done, had to relocate 50 out of 134 chunks real 0m4.546s user 0m0.000s sys 0m0.620s [32/531]mh@fan:~$ sudo btrfs fi df /media/tempdisk/ Data, single: total=79.00GiB, used=78.32GiB System, DUP: total=32.00MiB, used=16.00KiB Metadata, DUP: total=27.00GiB, used=2.30GiB GlobalReserve, single: total=512.00MiB, used=0.00B So one does not see a decrease in total Metadata size until -musage has gone up to 70, then it decreases by half a gig. -musage=75 is the first musage value that leads to the ENOSPC condition, with total Metadata size going up to 27 GiB again, and -musage=74 being the biggest musage value that finishs without ENOSPC, but no visible decrease of total Metadata size. Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
