Hello Paul, Monit use the data from "statvfs" (on Linux, use "man statvfs" to get detail information) only.
Keep in mind, with "every 5 cycles" Monit show the data from 5 cycles ago. The time when the data was collected is reported in "data collected". For example space total 391.0 GB (of which 0.0% is reserved for root user) space free for non superuser 7.1 GB [1.8%] space free total 7.1 GB [1.8%] data collected Sat, 14 Jun 2025 08:32:01 A suggestion only, Lutz p.s. See https://man7.org/linux/man-pages/man3/statvfs.3.html Am 13.06.25 um 22:23 schrieb Paul Theodoropoulos via This is the general mailing list for monit: > This is a minor issue, but I'm curious about it. > > I have a couple of disk space usage tests on /home (debian linux, ext4). > > 'df -h' reports: > /dev/nvme1n1p1 5.9G 3.7G 2.2G 64% /home > > I get the same percentage output regardless of '-h' (powers of 1024) or > '-H' (powers of 1000). The gigabyte values differ, the percentage > remains the same. > > Tune2fs reports no reserved blocks on the partition: > tune2fs -l /dev/nvme1n1p1 | grep 'Reserved' > Reserved block count: 0 > Reserved GDT blocks: 511 > Reserved blocks uid: 0 (user root) > Reserved blocks gid: 0 (group root) > > But Monit's status output reports: > space total 5.8 GB (of which 0.3% is reserved for root > user)" > > my disk space argument is: > > # HOME > check filesystem homefs with path /home > every 5 cycles > if space greater 63 % > then exec /usr/local/bin/pushover > repeat every 5 cycles > > The problem is, I will begin getting alerts before it reached 64% - as > reported by df - example: > > host [xxxxx] homefs - space usage 63.0% matches > resource limit [space usage > 63.0% > > As I said, minor - very minor - issue, though it is curious that Monit > thinks there are reserved blocks on a partition with none. It'd just be > great if there were a way to conform the output to match df's output. >
