back to article BOFH: Power corrupts, uninterrupted power corrupts absolutely

"THE POWER'S OUT!" the Boss shouts, blundering into Mission Control like a robotic vacuum in super-random turbo mode. "THE TRANSFORMER DOWN THE ROAD HAS EXPLO... hey, why are your lights still on?" "They're on the UPS. Aaaaaaaaaaaand... wait for it..." I say, after a slight flicker; "... on the generator, too." "Why is your …

This rings too true...

"Now we just need to ensure we get several pints into him before he realises that (a) we're not paying for our drinks (b) the pub is the only building on the block apart from Mission Control with power and (c) there's a thick cable which seems to join our two buildings."

Annoyingly my house, work and local pub (three separate buildings in about a mile radius) are all on the same supply/phase, so if one's off, everything's off.

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Re: This rings too true...

Virtually everything in any decent pub ought to be power-supply independent. Handpumps for ale. Gas cylinders for those who partake of lager. Optics or measuring cups for official spirit measures. Ice should last an hour or two.

The only problem zone is the till, for which a desktop-style UPS ought to provide enough energy to get a reasonable number of drinks in.

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Re: This rings too true...

Best drink those pints in the fridge before they warm up then...

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Re: This rings too true...

I remember a story I was told years ago where, during the oil crisis in the 70s when there were regular power cuts.

Anyhow a certain UK news company who had protected stasis never lost power. Next door was the pub with an inconspicuous cable crossing the street.

Oddly that pub never went dark. ..

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Re: This rings too true...

My home fridge draws a couple of hundred watts for about 15 seconds a minute. The freezer draws a little more, but you can run a fridge, freezer and lighting circuit of a small residential property off of a cheapish rackmount UPS of the sort that gets replaced every few years most places because it's more or less the same price as replacing the battery when it fails the self test.

You can also get a much more impressive run time by replacing the pathetic little 1.2Ah 12v batteries with 100Ah camping batteries, though admittedly it's a bit messy. You can do it semi cheaply from friendly scrapyards. (they store batteries that they think they have a hope of reselling)

I'd think that running a pub off of a UPS isin't massively infeasible.

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Facepalm

Re: This rings too true...

Fridge or not, we did have a breaker that did sometimes trip after power cuts. The thing is, all computers powered from that line (including the server room) were drawing a current well below the breaker's trip point, even on a startup surge. We knew since we measured it with a clamp meter connected to an oscilloscope.

...then someone powered up the aircon keeping said server room cool, and I saw the current promptly DOUBLED for a non-negligible fraction of a second. And yes, that was definitely more than enough to trip the breaker...

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Anonymous Coward

Re: This rings too true...

Back in the 1980s I was living right next to a hospital which meant I always had power even when power cuts happened or the Electricity Board people were on strike. I have no idea how that particular city block was wired but I did appreciate it.

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Pint

Re: This rings too true...

Re the till...

Was once drinking in pub in the northern suburbs of Darwin during the afternoon with a few other thirsty humans. Bar wasn.t busy, given the time of day. Suddenly, lightning hit the power lines in the street, rendering the pub powerless.

As described by Andy A above, beers could still be poured and rums could also be dispensed. But the till was a (back then) new style electronic till. No power meant the cash tray wouldn.t open. Bar manager and barmaid tried to get the tray open while the drinkers offered suggestions like "How about we give you the right amount and you just stick the money in a jug".

Anyway after about 10 minutes of fiddling, the bar manager managed to use a knife to prise the tray open. Service restarted, yrs truly ordered and paid for a round, bar maid takes the money, sticks it in the tray and by force of habit slams the tray shut. As an example of learning curve, manager re-opens the tray using the knife in less than a minute. And puts a glass longways in the till to stop it being closed.

So, yes to battery backup or mini UPS for tills.

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Re: This rings too true...

Re: Aircon tripping the breaker.

You had the wrong type of breaker installed. Look up "Type B" and "Type C". And, if you've got really massive inrush current, "Type D".

Now, try convincing the refurb crowd who installed Type B breakers on 20A radial circuits that they were told were supplying servers (and therefore via UPS's which have a hefty inrush current) that they installed the wrong breaker types when you find this out over a year after the refurb, and ought to replace them FOC....

Another item that's now on my checklist.

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Re: This rings too true...

Re: You had the wrong type of breaker installed.

Also should check what the factory needs - I've worked at places where they have to call to the electricity company when they want to restart the production line...

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Re: This rings too true...

The only way you can get your fizzy lager from a cellar is with a pump. The ale should go up hill nicely, but anything that requires a hit of nitro or CO2 needs a pump assist.

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Re: This rings too true...

And then there's the electricity company itself, too. Wrongly-rated overcurrent protection on a 275KV line led to around a quarter of London (and around half the tube) going dark a few years back.

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That's why any decent DR plan will include multiple geographically separated redundant pubs.

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A decent DR plan will include several geographically separated pubs. It would also account for transportation and overnight accommodation (since you're not going to drive back, are you?)

It's the Business Continuity plan that's lacking in useable resources close to hand. Carry out cool bag stocked with beers kept in the little fridge under the desk. If the principle BC site is unavailable to provide refreshment the beer garden can still be leveraged.

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Pint

Redundant Pub?

No pub should ever be redundant. They should always be in constant rotation to ensure the smooth transition of service from one to the other in a round-robin fashion.

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That was originally called a Redundant Array of Independent Pubs, but nobody liked the acronym very much.

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Coffee/keyboard

@Midnight

You owe me a new keyboard - that doesn't happen very often :)

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Thumbs up for that one Dr Who..............

.........."That's why any decent DR plan will include....."

Although honesty compels me to admit that, being a lowly organic chemist, I had to google that one before I got the joke!

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Gimp

Re: Redundant Pub?

The problem with the round robin approach is that you can't tell if the next pub is open before you leave for it, which leads to disappointment.

You could always leave a 'polling agent' in each one to test for availability, which resolves this problem.

Beer - well, for the reason stated above.

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Coat

Re: Dr Who

"That's why any decent DR plan will include multiple geographically separated redundant pubs." After having been railroaded on a few contracts, I added a term into my general contract that any site I worked at had to have a supply of coffee. HR drones almost always failed to query it, being more concerned with hours and pay rates. Of course, no-one puts their coffee vending machine or kitchen on generator or UPS so any powercut means I pack up and leave for the day.

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Re: Redundant Pub?

Aha!!! There might be a market for this using IoT. Maybe, finally, something useful will show up in the IoT.

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Anonymous Coward

Still a better acronym then a Redundant Array of Pubs Experienced.

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Pint

Uninterruptible Pub Supply!

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Thumbs up for that one as well TeeCee....although unlike Dr Who's contribution.......

........I did not have to google that one. The reason being that IT here at Uni arranged for a new one to be installed recently - I read the memo for once!

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What's that then, a pub with piping to connect it directly with the brewery across the road?

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Uninterruptible/ted Pint Supply, surely…?

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Coffee/keyboard

Bastard! T|N>K

Usually, BOfH leaves me nodding sagely in agreement. This time it's full on belly laugh - and I have a lot of belly ;-)

You owe me a new bloody K120 and a pot of screen wipes from Poundland.

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Windows

Re: Bastard! T|N>K

I'm sure that the BOFH could make sure that new K120 was quite bloody for you.

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Pint

I'm shocked.

Shocked that there was enough light for the boss to make it into mission control past the mains electronic gate. Beer time

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Re: I'm shocked.

You mean the electric gate to the car park and building entry system were also on the UPS?

Surely the boss, if not on site, is still at home trying to call a PABX number that is currently unavailable because no one programmed the emergency phone line number into his phone...

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Only me

Call me a pedant (I know you want to), but how do you get a heater with low efficiency? Everything ends up as heat eventually, even matter.

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Re: Only me

It's not only you, I wondered that myself

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Ogi
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Re: Only me

I fully agree with you in the long term (the march of entropy and all that).

On a shorter term though, I would say LED Lighting is an example of a really low-efficiency heater. You would only get ~10% of the input energy out as heat :-)

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Re: Only me

but how do you get a heater with low efficiency?

A light bulb is a low-efficiency heater.

A huge array of compact floursecent lights could be a great low-efficiency heater.

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Re: Only me

Maybe I'm missing something here. But what do you think the light is?

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Pirate

Re: Only me

"A huge array of compact floursecent lights could be a great low-efficiency heater."

Reminds me of my younger days as the maintenance helper at the local Sears and Roebuck's. There was no "heater" in the store's HVAC unit, all heat was supplied by the hundred or so fluorescent lighting fixtures in the drop ceiling, which, as normal, was also the return air duct. There was a chiller, though, that ran all year long, maintaining the temperature by removing more or less of the heat the lights radiated into area above the drop ceiling.

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Devil

Re: Only me

"what do you think the light is?"

If the goal is space heating, it's a waste by-product.

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Re: Only me

Even then the only waste is that which escapes through the windows. The rest just warms the surfaces it reaches.

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Re: Only me

...it's a waste by-product.

Until it hits an electron and transfers energy to it. It may not have been the intended route of transmission, but that doesn't affect it's efficiency at heating.

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Re: Only me

Surely "a heater with low efficiency" is any heat source incapable of boiling water for the tea and coffee needed to keep operators refreshed on-site and not at the pub...

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Re: Only me

Every electric heater is 100% efficient, except for some heat pumps that can be more than 100% efficient.

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Devil

Re: Only me

"how do you get a heater with low efficiency?"

As much as I do agree with you, you have to concede that the indoors element of an air conditioner would make a heater with a spectacularly lousy efficiency - as far as heating the room is concerned...

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swm

Re: Only me

I remember a collector that had a working old IBM 704 in his barn. He convinced the electric company to give him the heating rate as all of the electricity was 100% converted to heat.

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Honestly

I'm surprised that, in case of power outage, the doors don't automatically lock, except for the ones between mission control and the nearest fire escape. For security reasons of course. (So they can securely make it out of the building and into the pub without anyone noticing)

Perhaps leave a few other routes open for others to get out, via the door furthest from the mission control route.

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Love it

They would work perfectly well until they're needed.

Classic

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Anonymous Coward

Ah, reminds me of my previous jobs.

1) in the army testing some new communications equipment. Change over between generators meant relying on the UPS. This failed within seconds as someone hadn't wired up all the batteries.

2) second job looking after a large number of linux servers on my last night shift and the internet stopped working. Identified that the comms room was dark and that we'd lost power. Eventually someone located a bug in the UPS firmware meaning that the redundant supplies, generators and UPS's we had were all useless. I wouldn't have known until the hourly checks came round if the internet hadn't stopped!

Power failure, tends to ruin the whole day not just part of it!

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"the internet stopped working"

What? All of it?

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Yep. I asked for a loan of it so that you could use it in your speech.

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The little red light went out and everything.

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