zfswatcher reports ~2% high

[ewwhite]

I've been receiving alerts for 85% and 90% thresholds where the zpool information returned from the OS was 83% and 88%. Looking through the source, it seems as though this is a discrepancy between the "Free" and "Avail" reported by both methods.

This is ZoL 0.6.2 on CentOS.

[snabb]

I remember at some point having a strong feeling that the numbers do not add exactly. This is probably a bug in space calculation.