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Full Discussion: Wrong Array...
The Lounge War Stories Wrong Array... Post 303018166 by xenix on Wednesday 30th of May 2018 04:29:55 PM
Old 05-30-2018
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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HALT(8) 						Linux System Administrator's Manual						   HALT(8)

NAME
halt, reboot, poweroff - stop the system. SYNOPSIS
/sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] [-h] /sbin/reboot [-n] [-w] [-d] [-f] [-i] /sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h] DESCRIPTION
Halt notes that the system is being brought down in the file /var/log/wtmp, and then either tells the kernel to halt, reboot or power-off the system. If halt or reboot is called when the system is not in runlevel 0 or 6, in other words when it's running normally, shutdown will be invoked instead (with the -h or -r flag). For more info see the shutdown(8) manpage. The rest of this manpage describes the behaviour in runlevels 0 and 6, that is when the systems shutdown scripts are being run. OPTIONS
-n Don't sync before reboot or halt. Note that the kernel and storage drivers may still sync. -w Don't actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file). -d Don't write the wtmp record. The -n flag implies -d. -f Force halt or reboot, don't call shutdown(8). -i Shut down all network interfaces just before halt or reboot. -h Put all hard drives on the system in stand-by mode just before halt or power-off. -p When halting the system, switch off the power. This is the default when halt is called as poweroff. DIAGNOSTICS
If you're not the superuser, you will get the message `must be superuser'. NOTES
Under older sysvinit releases , reboot and halt should never be called directly. From release 2.74 on halt and reboot invoke shutdown(8) if the system is not in runlevel 0 or 6. This means that if halt or reboot cannot find out the current runlevel (for example, when /var/run/utmp hasn't been initialized correctly) shutdown will be called, which might not be what you want. Use the -f flag if you want to do a hard halt or reboot. The -h flag puts all hard disks in standby mode just before halt or power-off. Right now this is only implemented for IDE drives. A side effect of putting the drive in stand-by mode is that the write cache on the disk is flushed. This is important for IDE drives, since the kernel doesn't flush the write cache itself before power-off. The halt program uses /proc/ide/hd* to find all IDE disk devices, which means that /proc needs to be mounted when halt or poweroff is called or the -h switch will do nothing. AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl SEE ALSO
shutdown(8), init(8) Nov 6, 2001 HALT(8)

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