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Comment Single data centre for critical resource? (Score 2) 239

Blimey I wouldn't do that and running a bog standard stream service never mind an airline with 100 million a day of revenue.

500 servers is about 50 racks. About 500,000 a year plus about 2,000,000 for kit and 4,000,000 for software and licenses and 250,000 for interconnect . So capex 6,000,000 and opex call it 1,000,000 per annum.

I normally rate a major dc failure ( more than 10min ) at about once every 5 years.

Easy business case.

Also generator and ups fail over is tough to test with one dc. Which hit this one bad.

Comment Putin could do a nasty (Score 1) 296

Insist all Russian sites use a set of authorised ssl certificate authorities. Then insist Russian we browsers honour that list ( as internationally they would be de registered / not trusted in pem list ). Then the agency can spoof / proxy https traffic with access to cert authority private keys.

Comment Solar storage well known solutions (Score 1) 231

1) pump hydro ideal for Chile. Find a mountain with 2 lakes 1000m vertical apart. Pump water up at peak solar. Same turbines pump power onto grid after hours.
2) solar thermal - use mirrors to heat liquid salts from nominal to up to 800 degrees Celsius. Give you up to 6 hours outside solar hours to use tradition steam turbines to generate.
3) more long term - use batteries in vehicles and houses to charge in day and release outside solar hours
4) old school - use cheap power in daytime to power power intensive processes such as aluminium smelting
5) basic - heat up water in black bins on roof to provide hot water after hours

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