• 0 Posts
  • 4 Comments
Joined 2 years ago
Cake day: June 15th, 2023
  • tburkhol@lemmy.worldtoTechnology@lemmy.world•France runs fusion reactor for record 22 minutesEnglish
    7·
    3 days ago

    That’s my point: fusion is just another heat source for making steam, and with these experimental reactors, they can’t be sure how much or for how long they will generate heat. Probably not even sure what a good geometry for transferring energy from the reaction mass to the water. You can’t build a turbine for a system that’s only going to run 20 minutes every three years, and you can’t replace that turbine just because the next test will have ten times the output.

    I mean, you could, but it would be stupid.

  • tburkhol@lemmy.worldtoSelfhosted@lemmy.world•What does the 3-2-1 rule look like for you?English
    2·
    5 days ago

    I’ve always understood 2 as 2 physically different media - i.e., copies in different folders or partitions of the same disk is not enough to protect against failure of that disk, but a copy on a different disk does. Ideally 2 physically different systems, so failure/fire in the primary system won’t corrupt/damage the backup.

    Used to be that HDDs were expensive and using them as backup media would have been economically crazy, so most systems evolved backup media to be slower and cheaper. The main thing is that having /home/user/critical, /home/user/critical-backup, and /home/user/critical-backup2 satisfies 3 copies, but not 2 media.

  • tburkhol@lemmy.worldtoSelfhosted@lemmy.world•What does the 3-2-1 rule look like for you?English
    1·
    5 days ago

    3: RAID-1 pair + manual periodic sync to an external HD, roughly monthly. Databases synced to cloud.

    2: external HD is unplugged when not syncing

    1: External HD is a rotating pair, swapped in a bank box, roughly quarterly. Bank box costs $45/year.

    If the RAID crashes, I lose at most a month. If the house burns down, I lose at most 3 months. Ransomware, unless it’s really stealthy, I lose 3 months. If I had ongoing development projects, a month (or 3) would be a lot to lose, and I’d probably switch to weekly syncs and monthly swaps, but for what I actually do - media files, financial and smart-home data, 3 months would not be impossible to recreate.

    All of this works because my system is small enough to fit on one HDD. A 3-2-1 system for tens of TB starts to look a lot like an enterprise system.