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When the AFS servers where we keep temporary files hiccup, it's usually because they ran low on idle threads. It is possible to monitor this value and intervene to stave off disaster. It can be viewed with Ganglia or Nagios. Nagios only works inside SLAC's firewall, but is somewhat more reliable. Ganglia works from anywhere, and shows higher time resolution, but sometimes it stops updating and just shows a flat line with some old value.
Ganglia
- Ganglia threads page shows idle threads for all servers.
- Warren's custom disk monitoring pages shows just the servers we're actually interested in, and shows the mapping between server and volume names.
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