Am Mon, 19 Jan 2015 16:32:53 +0800 schrieb Bill Kenworthy <[email protected]>:
> Can someone suggest what is causing a balance on this raid 1, 3 disk > volume to successfully complete but leave the data unevenly distributed? > Content is mostly VM images. > > sdc and sdd are 2TB WD greens, and sda is a 2TB WD red. > > > rattus backups # btrfs fi sh > Label: none uuid: 04d8ff4f-fe19-4530-ab45-d82fcd647515 > Total devices 1 FS bytes used 8.25GiB > devid 1 size 271.36GiB used 23.04GiB path /dev/sdb3 > > Label: none uuid: f5a284b6-442f-4b3d-aa1a-8d6296f517b1 > Total devices 3 FS bytes used 1.90TiB > devid 1 size 1.82TiB used 1.77TiB path /dev/sdc > devid 2 size 1.82TiB used 1.77TiB path /dev/sdd > devid 4 size 1.82TiB used 270.03GiB path /dev/sda > > Btrfs v3.18 > rattus backups # btrfs fi df /mnt/btrfs-root/ > Data, RAID1: total=1.90TiB, used=1.89TiB > System, RAID1: total=32.00MiB, used=464.00KiB > Metadata, RAID1: total=8.00GiB, used=6.53GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > rattus backups # btrfs fi usage /mnt/btrfs-root/ > Overall: > Device size: 5.46TiB > Device allocated: 3.81TiB > Device unallocated: 1.65TiB > Used: 3.80TiB > Free (estimated): 845.00GiB (min: 845.00GiB) > Data ratio: 2.00 > Metadata ratio: 2.00 > Global reserve: 512.00MiB (used: 154.42MiB) > > Data,RAID1: Size:1.90TiB, Used:1.89TiB > /dev/sda 265.00GiB > /dev/sdc 1.77TiB > /dev/sdd 1.77TiB OK, that is odd. While my experience with BTRFS RAID1 was that the FS is never perfectly balanced, this is just... weird. If I were you, I would ask on the BTRFS ML. > Metadata,RAID1: Size:9.00GiB, Used:6.96GiB > /dev/sda 6.00GiB > /dev/sdc 7.00GiB > /dev/sdd 5.00GiB This I would see as perfectly possible with BTRFS RAID1. > System,RAID1: Size:32.00MiB, Used:464.00KiB > /dev/sda 32.00MiB > /dev/sdd 32.00MiB > > Unallocated: > /dev/sda 1.55TiB > /dev/sdc 47.02GiB > /dev/sdd 47.99GiB > rattus backups # HTH -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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