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AFS buffers & idle threads

Skip this whole section, we buffer on xroot now.

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.

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