diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/rabbit_disk_monitor.erl | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/src/rabbit_disk_monitor.erl b/src/rabbit_disk_monitor.erl index 031a04f0a1..6aa19b3cfa 100644 --- a/src/rabbit_disk_monitor.erl +++ b/src/rabbit_disk_monitor.erl @@ -16,6 +16,19 @@ -module(rabbit_disk_monitor). +%% Disk monitoring server. Monitors free disk space +%% periodically and sets alarms when it is below a certain +%% watermark (configurable either as an absolute value or +%% relative to the memory limit). +%% +%% Disk monitoring is done by shelling out to /usr/bin/df +%% instead of related built-in OTP functions because currently +%% this is the most reliable way of determining free disk space +%% for the partition our internal database is on. +%% +%% Update interval is dynamically calculated assuming disk +%% space is being filled at FAST_RATE. + -behaviour(gen_server). -export([start_link/1]). @@ -34,14 +47,22 @@ %% 250MB/s i.e. 250kB/ms -define(FAST_RATE, (250 * 1000)). --record(state, {dir, - limit, - actual, - min_interval, - max_interval, - timer, - alarmed - }). +-record(state, { + %% monitor partition on which this directory resides + dir, + %% configured limit in bytes + limit, + %% last known free disk space amount in bytes + actual, + %% minimum check interval + min_interval, + %% maximum check interval + max_interval, + %% timer that drives periodic checks + timer, + %% is free disk space alarm currently in effect? + alarmed +}). %%---------------------------------------------------------------------------- |