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I have a computer that monitors some servers. I would like to connect a device to the computer that can be turned on (like a siren or police light) when some anomalies are detected on the server. Essentially - I'd run a script to turn on the device and then power it off.



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To those voting to migrate. I don't believe this is a better fit for superuser. Having an out-of-band notification system is something many system administrators may find useful. – Zoredache Oct 2 '10 at 6:31

X10 Serial -> relay/power control

Alternatively, power strip that is IP accessible and controllable via SNMP or Telnet with an expect script. APC makes one that is fairly workable that we use for a stonith handler.

D to A converter, allows you to control a relay attached to the serial port.

Sparkfun makes a USB relay.

Arduino boards can be handy

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There many devices designed for notifying deaf/hard-of-hearing people when an incoming phone has been made. Many would allow you to setup indicator light anywhere you have an analog phone line. All you need is a modem on your monitoring system to call the number.

If you get a voice modem on your monitoring system you may be also able to have it call and leave you a message on a cell phone in case the network is down.

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Do not underestimate the value of scrolling LED sineage! A lot of those signs are USB connectable which allows you to program their messages on the fly. Handy for indicating which widget is on the blink.

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Any recommendations for LED sineage? – user55929 Oct 2 '10 at 8:30
@Mark I haven't bought any myself, but other departments at work have used them. I can't recommend anything in any meaningful way. The google term "scrolling LED signs" will bring buckets of hits. – sysadmin1138 Oct 2 '10 at 8:33

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