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The Lounge War Stories Wrong Array... Post 303018166 by xenix on Wednesday 30th of May 2018 04:29:55 PM
Wrong Array...

Back in my early days, just starting at my first job where I was doing 100% UNIX...

We had a mixture of Solaris, AIX, and HPUX systems. Our most critical systems (Logistics) was running on a bunch of large HP 9000 servers. I was tasked with decommisoning one of the servers.

It was one of those arrangements where there was three cabinets in a row. One large HP 9000 on each side, and the middle was used to store the boot disks, tape drives, optical drives, etc.

Well, long story short.. I hit the power button on the wrong storage cabinet. Did a few other things... Casually walked back to my desk. It was a good 20 minutes later.

All of a sudden, people are screaming.. PROD IS DOWN.. PROD IS DOWN. I thought, great.. Another fun day....

A few minutes later, it dawned on me that the drives for the production server was in the same rack that I was decommissioning. So, I walked back down to the data center to verify... Sure enough. I hit the wrong button.

I turned the array back on, walked back to my desk, and could now login again, and everything was fine. To my surprise.. There was no fallout from this. This system just completely hung... once the storage was turned back on, it just kept on going where it left off.
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starting(7)						 Miscellaneous Information Manual					       starting(7)

NAME
starting - event signalling that a job is starting SYNOPSIS
starting JOB=JOB INSTANCE=INSTANCE [ENV]... DESCRIPTION
The starting event is generated by the Upstart init(8) daemon when a new instance of a job begins starting. The JOB environment variable contains the job name, and the INSTANCE environment variable contains the instance name which will be empty for single-instance jobs. init(8) will wait for all services started by this event to be running, all tasks started by this event to have finished and all jobs stopped by this event to be stopped before allowing the job to continue starting. This allows jobs to effectively insert themselves as dependencies of other jobs. The event is typically combined with the stopped(7) event by services. Job configuration files may use the export stanza to export environment variables from their own environment into the starting event. See init(5) for more details. EXAMPLE
A service that wishes to be running whenever another service would be running, started before and stopped after it, might use: start on starting apache stop on stopped apache A task that must be run before another task or service is started might use: start on starting postgresql SEE ALSO
started(7) stopping(7) stopped(7) init(5) Upstart 2009-07-09 starting(7)

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