I have a 5 disk array (1x2Tb + 4x3Tb). Previously, this was formatted
as RAID1, but I've been converting it to RAID10. As the conversion has
progressed, I've noticed that the Unallocated figure for each device
has slowly increaed, while the Overall "Device unallocated" and "Free
(estimated)" figures have remained fairly constant (as expected).
At just over 50% through the conversion, the output of 'btrfs file
usage -Tg /home' shows:
Overall:
Device size: 13041.10GiB
Device allocated: 12867.46GiB
Device unallocated: 173.64GiB
Device missing: 0.00GiB
Used: 12558.29GiB
Free (estimated): 240.19GiB (min: 240.19GiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 0.50GiB (used: 0.09GiB)
Data Data Metadata Metadata System
single RAID1 RAID10 RAID1 RAID10 RAID1 Unallocated
/dev/sdb - 15.00GiB 864.48GiB - 2.75GiB - 980.79GiB
/dev/sdc - 1364.00GiB 707.70GiB 2.00GiB 2.50GiB 0.03GiB 718.29GiB
/dev/sdd - 1359.00GiB 712.07GiB 1.00GiB 1.50GiB - 720.95GiB
/dev/sde - 905.00GiB 929.19GiB - 2.75GiB 0.03GiB 957.55GiB
/dev/sdg - 1311.00GiB 730.25GiB 1.00GiB 1.50GiB - 750.77GiB
======= ========== ========== ======== ======== ======= ===========
Total 0.50GiB 2477.00GiB 3943.70GiB 2.00GiB 11.00GiB 0.03GiB 4128.34GiB
Used 0.09GiB 2476.35GiB 3790.98GiB 0.96GiB 10.85GiB 0.00GiB
My suspicion is that the 'data' size for RAID10 is showing the
allocation for only one copy of the data, rather than the 2 for RAID1,
and that the 'Unallocated' size, presumably calculated by subtracting
the size of the data and metadata from the total size of the disk, is
therefore incorrect.
Can someone familiar with the source code of btrfs-progs confirm if
this is correct or, if the figures are correct, my RAID1 is actually
being converted to RAID0!
Thanks
--
Derek
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