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The first uVAX I worked on was around 86,don'tremember the model, but quit the company not long after they got it and I moved to Florida to work on a PDP 11/23. Like going from a Cad to a Pinto!
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I used PDP-11s in high school and some college, then VAX-11.
My co-op job in college was managing a MicroVAX 3600 -- their PDP-11 was sitting cold and unused by that time.
Then I used mostly VAX and Alpha until 2002. Just a hobbyist since then.
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ditto mike. amazing os
"A little time, a little trouble, your better day"
Badfinger
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Upgrading this site's hosting setup?
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
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A couple years ago I had set up a 3-rPi cluster where one was hosting an ngix server, ideally to route different domains coming in on the same public IP to different web applications, which was working great. The second rPi was the database server and had an external SSD connected to it, and the third rPi hosted the actual web apps. All was working, then a traumatic event happened in my life and the project and Code Project articles I had planned to write went to the wayside. It was sad. I hope I still can find my notes on how all this was configured when at some point I resurrect this project.
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Look up Jeff Geerling on the various platforms - youtube. He has been reviewing different housing / backplane for the Pi family.
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Well I'm pretty sure you can use OpenMPI on any Raspbian distribution but I think, alternatively, OpenCL is available on the Pi3 (and I heard Vulkan has parallelism, so you can use that on the Pi4).
In short, anything that would've required a cluster of 4 SGI workstations back in the day. Probably a cool, portable, quick and dirty render farm?
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Southmountain wrote: What kind of projects can we do on this?
I would say that is exactly the question - why would you want to do that?
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because this is a cluster, I am thinking to run some machine learning model to absorb a knowledge in a specific domain...
diligent hands rule....
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How about calculating Pi? 
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You could do data mining with an open source tool that can do parallelism to distribute the compute capabilities among all the cluster members. You could as well load balancing for Web Apps. Many posibilites limited by your imagination.
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I'm all into the cluster thing - but that's a really big word technically. DEC had the tech for clustering. That said, negative feedback on the product - for $80 you get a frame you can plug boards into. Okay, I get that.
Where are the boards? The listing implies you get 4 boards, but I don't think so.
Many years ago, I worked in the land of VME. By definition - if you had a VME board, it adhered to that standard. Rolling out a product based on this, I would hesitate. Heck, most pi boards do quite well performance wise, so why do I need a cluster?
Charlie Gilley
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Has never been more appropriate.
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Ugh, I'm looking for an uninterruptable power supply rated for my 1000W/15A PC and my ???W/???A 55" monitor because I've had a few power scares lately.
I bought one without checking the ratings, and it's useless. I'm probably going to give it away just because I don't want to deal with the return. It wasn't that expensive - about as expensive as it was useful.
I'm finding the difference between 1000W protection and 1500W protection is about $250 vs $550, and a huge size difference as well, and I have limited space.
I'm going to use one of those $30 power consumption monitors to see what my real world draw is when I'm not banging on my video card or CPU.
For the first time, I'm kind of longing for a relatively low power AMD system again, instead of my 180W TPD CPU and 320W TPD GPU. My power supply is rated @ 1000W / 15A, but I'm sure that's peak, but then again so is the rating on the UPS, unless I spend another $130 USD to get 1000W sustained output.
Anyone have a power hungry system on a UPS? What did you get?
To err is human. Fortune favors the monsters.
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APC Backup-UPS Pro 1500VA. Looking on the APC site seems it's no longer available (model BR1500MS). They have however other models that might fit your needs.
Years of pain have taught me stay away from any UPS that is not APC. Might be a bit more expensive but quality is great and their service superb. In the end, if you pay a bit extra it gets amortized over the years of trouble free service.
Mircea
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I hate to say this, but Amazon's reviews on APC's top end products are pretty negative. A lot of people having to have units RMA'd and replaced due to defect or otherwise complaining about performance or glitches.
Many of them are saying they used to rely on APC but it has went downhill.
You may have lucked out by having one of their older units, but those reviews make me uncomfortable. Other brands like cyberpower aren't coming up with reviews like that as much
To err is human. Fortune favors the monsters.
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Your mileage may vary but I’ve been using APC units for the last 15 years (I think). Previous bad experience was with triplite and cyberpower. Had only one APC unit die on me (actually on my son) and they sent a replacement unit in 2 days. Cool thing is that you send the bad unit only after you get the new one. Saves you the hassle of finding package for the old one.
Mircea
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My experience is similar to yours. I have 4 APC 1500's and they perform flawlessly (knock on wood), while I have had poor experiences with CyberPower and Triplite. All of my APC's are at least three years old.
I sold a Threadripper system a couple of months ago and tossed in an older APC unit (1350 I believe) that I had laying around. Too bad I could have sent the HCW for the cost of shipping.
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If you want to level up from APC you have to go to Eaton.
Been using them to power server racks on several places. Been extremely reliable, but also a bit pricey.
Selection starts here: Backup Power UPS[^]
(Read the FAQ near the top of the page)
You probably don't need to bother with a standby UPS, but rather a Line-interactive or Online
If you go for standby you can just as well buy an APC.
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I just contacted them for a quote, but the fact that I had to is sort of intimidating.
To err is human. Fortune favors the monsters.
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You can buy them on Newegg[^] if you'd like.
Pretty sure you can find other online stores as well.
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Did you buy yours online?
I decided to buy mine at local Best Buy (yes there is still one here where I live) because I saw so many fraudulent items on Amazon which were supposed to be from APC.
If you read the reviews you will see that fraudsters can take over the sales listing and make it look like it is official product but it is not.
Some people had there "APC" product explode in fire.
I bought my APC at the beginning of the pandemic (ca 2020) and it is still working great.
I suggest you try to buy the product locally if you can, not thru amazon.
The fraudsters can make the product look just like official product but it is garbage.
It was shocking to me to learn this too.
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I have the same here.
The transformer in the thing may be a bit suspect though. I'm hearing they are using aluminum wiring in them and soldering to aluminum is not the most reliable connection. If it fails, chances are that's what is going to do it.
Other than that, everything else in them is rock solid.
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It seems you are looking for a UPS that will keep you working while there is a power outage...
It will you coast - in money and headache - more than you can imagine. I have learn that UPS is there to give you time to shut down gracefully and not to keep you running...
"If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization." ― Gerald Weinberg
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Kornfeld Eliyahu Peter wrote: I have learn that UPS is there to give you time to shut down gracefully and not to keep you running
That's exactly what I want it for.
But you have to understand my PC draws about as much juice as at least half dozen laptops.
I want to be able to plug in everything i spent more than $500 on into it.
Why? Because when the construction going on across the street shorts the power line to my house again I don't want it to blow up my computer, or its $900 monitor.
Equipment attached to a UPS is typically decoupled somewhat from the power source, using the battery as a go-between, and otherwise is more isolated than you can get with a surge suppressor.
I honestly don't care about shutting down gracefully. I care about weathering about 100 current spikes in the span of a minute.
To err is human. Fortune favors the monsters.
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