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The BIG EEVblog Server Fire

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tooki:

--- Quote from: 3roomlab on April 08, 2021, 08:06:03 pm ---maybe it is time to move to other countries with less power interruptions







--- End quote ---
As someone who has lived in both North Carolina (the worst-ranked place in those graphs) and Switzerland (the best-ranked in those graphs), anecdotally, my experience completely agrees with that! (When I moved from USA to Switzerland the second time, I didn’t even bother buying a UPS, since the power here never goes out. Good enough for my home computing.)

Nusa:
Dave scares gnif.

Sounds normal.

hamster_nz:

--- Quote from: Ultrapurple on April 08, 2021, 04:37:40 pm ---How many miles apart do your data centres have to be before it's quicker to send the data via wires than wheels?

--- End quote ---

With a stupid number of media devices (e.g. tape drives) at either end the answer is:

10km / 6 mile

That is about the limit for single-mode fibre running at 10G Ethernet....

peter-h:
There is no easy solution to server backup, because you never know what common vulnerabilities there are.

And how much do you want to pay? EEVBLOG probably doesn't make millions :) A fully redundant solution isn't cheap.

I run a few sites on virtual servers, with various backup policies (which I won't write about openly for obvious reasons) and if the virtual server company blew up and vanished for ever, I could start up a backup server which is a media PC running on an FTTP (80/30mbps) ADSL line :) That would actually be fast enough for EEVBLOG, on a bad day. Times have changed; this would not have been possible 10 years ago, and the bw required for EEVBLOG is probably of the order of 100-500GB/month which is nothing. And the whole real server is rsynced (only changed files copied) to this media PC every night. There are other backups of course because you cannot mirror the whole server, due to many open files etc. I would merely need to manually edit the DNS panel which is hosted by a company different to the server company. So the worst case is losing a day's data. It is practically impossible to lose everything, in this setup, and it is very cheap.


ve7xen:

--- Quote from: hamster_nz on April 09, 2021, 05:44:04 am ---
--- Quote from: Ultrapurple on April 08, 2021, 04:37:40 pm ---How many miles apart do your data centres have to be before it's quicker to send the data via wires than wheels?

--- End quote ---

With a stupid number of media devices (e.g. tape drives) at either end the answer is:

10km / 6 mile

That is about the limit for single-mode fibre running at 10G Ethernet....

--- End quote ---

100G at 80km is trivial with off the shelf gear these days, and I don't imagine many datacentre interconnects are only 10G.

Even so, the wheels win when it takes longer to transfer the data than it would to drive the media. At 100G you can transfer ~45TB/hr. That's only 4 or 5 hard drives or LTO-8 tapes so it's not hard for the car to win. If you fill a typical station wagon small SUV (~2000L cargo area) with LTO-8 tapes (~275cm^3), you can fit about 7,500 tapes (x12GB native, no compression here) for 90PB. At 45TB/hr on your 100Gbps that would take 2000 hours during which you should be able to drive/sail anywhere on the planet. Of course it's usually much more practical to transfer it; copying the data to/from the media becomes a significant time sink itself, but that may or may not matter.

Fibre can only reasonably win this race when the data volume is relatively small, even when you start talking about 400G systems or multiple links, what you can transfer in an hour still fits in a suitcase.

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