Per Jay's request, log plab isalive events originating from the plab service
slivers in order to track elab<->node connectivity. A timeval struct is appended to a file (one per node) inside /usr/testbed/log/plabisalive. The reporting rate has been cranked up to once per minute. Therefore, if all 650 plab nodes where reporting in, that amounts to about 10 reports/sec, or 14KB/min leading to a disk consumption rate of 21MB/day (617MB/mo or 7.5GB/year). Not sure how long we are going to be running this.
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