in reply to Perl ICMP ping multiple servers connect availability check simultaneously
See AnyEvent::Ping and AnyEvent::FastPing for an example of how to do this for 500 machines in parallel.
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Hope and Pray
Hash & Salt using Acme::XKCD::DebianRandom
Hash & Salt using other rng algorithms
Printouts secured with physical locks
One of a million Post-Its sticking on the monitor
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