Black-Out and remote powering

Hi all,

I am on holiday and yesterday my house had the first black-out since 3 years.
Black-out was round about 3 hrs (at least this ia what I see from logs of Synology NAS, of my Fritz!Box and from a couple of cameras).
Unfortunately after the black-out the Mini did not start automatically even if I am almost sure that is configured to reboot after a black out.
Now I am three weeks not at home without home automation. At 10PM Indigo had to close the rollers but the black-out was at 9.57PM.

I plan to build a small robot to press the power button of the Mini in order to have a backup solution.
Also a UPS would had help.

I also have the fear that the internal disk has some problem, and therefore it did not boot properly.

On that internal disk use an SSD. Amazon will sell you a very reliable 500-GB Samsung SSD for like $170 USD's. We design and build and sell 'mission computers' for defense, tanks, planes, choppers....would never use any drive but SSD.

Well, with SSD you do not have any mechanical ORR, but file system can get corrupted as well. I also work on critical system and we had problem also with SSD with integrated buffer (2ms) to allow finish writing procedure. The solution is a UPS. Even if I do not know yet what happened to my mini

Yeah you should see what i go though to get power to military grade hardware. Understand the fun.

We are on the same boat

So buy more smaller drives and use one of the fault tolerant RAID variants with a hot spare.

An issue if you use ups to gracefully shutdown your mac. It does not restart if the power comes back. You manually have to press the power button. One way around this is a scheduled reboot that you move forward every 15 minutes to e.g. 1 hour a head. Then when you have a short power failure it will restart. Or you set the reboot to 5 hours ahead then it's more likely that you will be out of the window if power down.


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If you have Indigo or some other watchdog-style process monitor power and upon power-loss run a "shutdown -u" command, AND ALSO make sure your UPS shuts down within 5 minutes after running that command, it should satisfy the requirements of a "dirty shutdown" and restart after power is applied, in theory at least. I haven't tested it...

snippet from "man shutdown"

Code: Select all

SYNOPSIS
     shutdown [-] [-h [-u] | -r | -s | -k] [-o [-n]] time
              [warning-message ...]

     -u      The system is halted up until the point of removing system power,
             but waits before removing power for 5 minutes so that an external
             UPS (uninterruptible power supply) can forcibly remove power.
             This simulates a dirty shutdown to permit a later automatic power
             on. OS X uses this mode automatically with supported UPSs in
             emergency shutdowns.


Terry

That's interesting have to try that.


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This has always been a concern for me. Our Indigo is on a UPS but after a shutdown, how do you make the server power back-up.? As we are in South Florida, this will happen eventually...

Now, what would be the mechanism to issue that Shutdown command? If is script, could someone provide a sample of how to do it?

Thanks in advance.

JP

So, the problem was that the option "switch on after power interrupt" (or something similar) was not checked, therefore it stayed off

Never had a power interrupt in two and half years.

Not fully related to this thread but Saturday night I could not connect to Indigo Server.
So I tried to connect to the MacMini unsing Screen Sharing, no success.

I connected the Mini to the TV, nothing, rebooted...and after some seconds the Mini shut down itself; I was able to restore the OS using Internet and to migrate everything using TimeMachine (done on my NAS, it was the first time that I did it via network, I did it a few times but only via USB).

Everything worked fine; not yet had time to investigate what happened, but I fear that the disk as some problems because before doing a reinstall I could not even repair the disk (error code

This has always been a concern for me. Our Indigo is on a UPS but after a shutdown, how do you make the server power back-up.? As we are in South Florida, this will happen eventually...

Now, what would be the mechanism to issue that Shutdown command? If is script, could someone provide a sample of how to do it?

Thanks in advance.

JP

Yeah, that would be interesting