Greetings, I would like to ask what what is healthy amount of free space to keep on each device for btrfs to be happy?
This is how my disk array currently looks like
[root@dennas ~]# btrfs fi usage /raid
Overall:
Device size: 29.11TiB
Device allocated: 21.26TiB
Device unallocated: 7.85TiB
Device missing: 0.00B
Used: 21.18TiB
Free (estimated): 3.96TiB (min: 3.96TiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:10.61TiB, Used:10.58TiB
/dev/mapper/data1 1.75TiB
/dev/mapper/data2 1.75TiB
/dev/mapper/data3 856.00GiB
/dev/mapper/data4 856.00GiB
/dev/mapper/data5 1.75TiB
/dev/mapper/data6 1.75TiB
/dev/mapper/data7 6.29TiB
/dev/mapper/data8 6.29TiB
Metadata,RAID1: Size:15.00GiB, Used:13.00GiB
/dev/mapper/data1 2.00GiB
/dev/mapper/data2 3.00GiB
/dev/mapper/data3 1.00GiB
/dev/mapper/data4 1.00GiB
/dev/mapper/data5 3.00GiB
/dev/mapper/data6 1.00GiB
/dev/mapper/data7 9.00GiB
/dev/mapper/data8 10.00GiB
System,RAID1: Size:64.00MiB, Used:1.50MiB
/dev/mapper/data2 32.00MiB
/dev/mapper/data6 32.00MiB
/dev/mapper/data7 32.00MiB
/dev/mapper/data8 32.00MiB
Unallocated:
/dev/mapper/data1 1004.52GiB
/dev/mapper/data2 1004.49GiB
/dev/mapper/data3 1006.01GiB
/dev/mapper/data4 1006.01GiB
/dev/mapper/data5 1004.52GiB
/dev/mapper/data6 1004.49GiB
/dev/mapper/data7 1005.00GiB
/dev/mapper/data8 1005.00GiB
Btrfs does quite good job of evenly using space on all devices. No, how
low can I let that go? In other words, with how much space
free/unallocated remaining space should I consider adding new disk?
Thanks for advice :)
W.
--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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