And unless the question's asker is working in the video editing industry, chances are that not much of these 20tb change on a regular basis.
It should be possible to build a 24Tb or 28Tb RAID-6(*) backup server, that could still quite a few daily/weekly/monthly/yearly backups, provided a space-efficient snapshot rotation system. (Not actually keeping separate copies, but either using a file-systems Copy-on-Write snapshots like BTRFS' or whatever is the ZFS equivalent, or using the old classic RSync+hardlinks).
The only thing that you don't solve is disaster resilience (you'll need an offsite replicate for *that*).
(*) At this size, hardware failure are going to be a certainty. RAID-6 (or ZFS's RAID-Z2) are the best solution against bitrot and for resilience against dead drives.
You're better off building a second server.
Then use one server as the live server (the one which access from the network to work).
and the other as a server.
- doing rsync and directory rotation [either ZFS/BTRFS/etc. snapshotting, or plain old rsync+hardlinks and directories] should work, specially that (unless you work in the video editing business) chances are that not a big chunk of the 18 TB change a lot. So you could invest into 24 TB of RAID-6 or RAID-Z2 and afford to keep a few daily/few weekly/couple of monthly+yearly snapshots.
Give it a rest, you lost your money and nobody can prove where it went. Oh the joys of an unregulated currency.
Give it a rest, you gave your money to Madoff. He lost it and nobody can prove where it went. Oh the joys of a regulated currency.
Good news though you also got to caught up a bunch of money in Taxation to support the SEC that didn't save you...
It stopped when it erased '/lib/libc.so'.
Why? I can use rm to remove
Why the hatred ?
PS: to me you are all just chariot-racing fans.
The problem with your reasoning is that it presumes that money is given in exchange for work of equal value, but of course the very basis of business is that you pay less than what the work is worth, and the difference is your profit. So this notion of a 1:1 connection between money and value is simply mistaken, and not only that, it's impossible in a capitalist society.
No you don't understand capitalism.
In a free market people don't exchange something of lessor value for something of greater value or vice versa, one of the parties would never agree. What happens is we meet and discover we value things differently.
If I hire you do a job, I do so because I value the "work" less than my money. That might be for any number of reasons: maybe I don't have time to do it myself despite the need; maybe I have a lot of money I don't need for anything else; maybe I don't know how to do the work and so If I chose to invest time instead of dollars the costs would be much greater; etc.
You on the other hand have offered to do the work because you have time, and want something else more and believe that you could satisfy that if you had more money. You value your time and labor less than my dollars.
If that's true and it's not a pwned router like the link below suggests, that's fucked up.
FWIW, I have plenty of experience -- enough to use dialup before I'd sign up with comcast -- but I underestimated their scummyness and did not, in fact, know that their routers used MITM attacks on their customers.
Link to Original Source
Uh... what are you talking about? As long as it's a valid and reachable DNS server, it doesn't matter what the hell the router says the DNS server is.
You can 184.108.40.206 is google but you could just any valid dns server.
No it will try them in the order listed until it gets a 'response'; I think if it gets a response like SRVFAIL it will also continue trying the remaining servers, but if gets a incorrect NXDOMAIN it will trust that value and not try the remaining servers.
My father taught, and was very good at math. I also teach, and used to teach math to my fellow students in high school.
Being good at math is like being a good programmer -- iterative process, more than one way of doing things, things build on other things. Not something that everyone is good at, but not something that "you can't teach because you are good at it".
How so? Just about every modern OS (can't speak for OSX from experience, but I'll call it an educated guess) lets you set the computer's DNS instead of having it assigned via DHCP from the router.
When it's your first day of your first job out of college, odds are strongly in favor of your not being a good programmer.