2003-11-09 14:46:31 +00:00
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2001-10-22 17:33:55 +00:00
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<META name="author" lang="en" content="Michiel Broek">
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<TITLE>Using UPS semafore's.</TITLE>
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<BLOCKQUOTE>
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2003-11-09 14:46:31 +00:00
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<div align='right'><h5>Last update 08-Jun-2001</h5></div>
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<div align='center'><H1>MBSE BBS - Using UPS semafore's.</H1></div>
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2001-10-22 17:33:55 +00:00
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If you have a UPS and you are able to let your UPS software create semafore's when powerfail conditions
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occur then read on. The MBSE BBS taskmanager and a lot of utilities will act on two special semafore's,
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they are:
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<ol>
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<li><code>upsalarm</code>, this semafore should be set when there is no mains power, but there is enough
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power left to operate your system. All background tasks will be suspended as long as this condition
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is true. If the power comes back, the UPS software should remove this semafore.
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<li><code>upsdown</code>, this semafore should be set when the UPS sofware signals your system to go down.
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This is a fatal condition and there is no way back. Even if the power comes back your system should
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shutdown and the UPS will disconnect the power to your system. After a while it will turn the power on
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again and your system boots. MBSE BBS will if this semafore is seen kick users out of the bbs, and the
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system shutdown script will try to close MBSE BBS as quick as possible. Normal the close timeout is
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one hour to let users normal finnish what they were doing, now it is only 30 seconds and if they were
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not logged out, they will be disconnected anyway.
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</ol>
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I know not all UPS software can do this but most UPS software is open source so you can change it to create
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these semafore's. It is not a problem that UPS semafore's still exist if the systems boots, the MBSE BBS
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startup scripts will remove them before the bbs is started.
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2003-11-09 14:46:31 +00:00
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