I am a bit confused about metrics naming and numbers. The helper said
# HELP node_btrfs_size_bytes Amount of space *allocated* for a layout/data
type
# TYPE node_btrfs_size_bytes gauge
node_btrfs_size_bytes{block_group_type="data",mode="single",uuid="4cd95d43-a0f5-4c13-8620-518034fe3472"}
3.1138512896e+10
node_btrfs_size_bytes{block_group_type="metadata",mode="dup",uuid="4cd95d43-a0f5-4c13-8620-518034fe3472"}
2.147483648e+09
node_btrfs_size_bytes{block_group_type="system",mode="dup",uuid="4cd95d43-a0f5-4c13-8620-518034fe3472"}
8.388608e+06
However when you measure FS by
btrfs filesystem usage /my/btrfs
Overall:
Device size: 158.75GiB
Device allocated: *33.02GiB*
Device unallocated: 125.73GiB
Device missing: 0.00B
Used: *29.94GiB*
Free (estimated): 126.40GiB (min: 63.53GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 132.03MiB (used: 0.00B)
Converting 3.1138512896e+10 bytes to GiB is *29.94GiB.*
So what we are measuring, allocation or used space?
And yes, is there ny change to get allocated space ? AFAIK this is a
critical metric for btrfs, it tend to crash or alert with out of space if
no allocation is possible.
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