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Joined 1 year ago
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Cake day: July 1st, 2023

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  • In my system, the raid arrays seem to do periodic data scrubbing automatically. Maybe it’s something that’s part of Debian, or maybe it’s just a default kernel setting. I don’t think it helps much with data integrity – I think it helps more just by ensuring the continued functionality of the drives.

    When it’s running, you can type cat /proc/mdstat to see the progress.

    That command will also show you if there is a failing drive, so that you can replace it.





  • Epigenetics is black magic to me. The starvation thing is true, but it mostly happens in the liver and pancreas and stuff. The testicles and ovaries don’t express the genes relating to starvation, even when starved. So how does the reproductive DNA pass on epigenetic data to the child and grandchild?


  • Sure. First you set up a RAID5/6 array in mdadm. This is a purely software thing, which is built into the Linux kernel. It doesn’t require any hardware RAID system. If you have 3-4 drives, RAID5 is probably best, and if you have 5+ drives RAID6 is probably best.

    If your 3 blank drives are sdb1, sdc1, and sdd1, run this:

    mdadm --create --verbose /dev/md0 --level=5 -n 3 /dev/sdb1 /dev/sdc1 /dev/sdd1

    This will create a block device called /dev/md0 that you can use as if it were a single large hard drive.

    mkfs.btrfs /dev/md0

    That will make the filesystem on the block device.

    mkdir /mnt/bigraid
    mount /dev/md0 /mnt/bigraid
    

    This creates a mount point and mounts the filesystem.

    To get it to mount every time you boot, add an entry for this filesystem in /etc/fstab






  • The easiest way to disable unnecessary services is to uninstall them with aptitude, or whichever package manager you like. Try terminating services one by one, and see if anything bad happens. If nothing bad happens, you can probably uninstall it. On the other hand, if the system does get wonky a reboot should fix it. Or, you can research the services by name and decide whether to uninstall them. (avahi-daemon for example is a good idea to uninstall.)

    To make the GUI not run, uninstall your display manager (gdm, xdm, nodm, or whatever) and uninstall your xorg server or wayland server. There may be GUI programs remaining after that, but they will only be consuming disk space, not RAM or CPU.

    If the battery is old and holds little charge, you may save a few watts by removing it and throwing it away, instead of letting the system keep it topped off.

    Get a power meter, such as a Kill-a-watt device. Then, experiment with different settings. If it’s consuming less than 30 watts, you’re probably fine. If you live in the US, one watt-year is about one US dollar (or a little more), so for every watt it consumes, that’s about how much you will pay per year for its electricity.



  • “According to DataDome”. A company who sells that as a service.

    More likely, they just don’t have any obvious protections that DataDome’s lazy engineers could identify. They probably just checked IP ranges to see if the services were proxied by DataDome, Cloudflare, or another such service.

    I don’t trust anything DataDome says, because they are a known shitty service. They will arbitrarily block users, intercepting their requests to show a captcha page. Then, after the user correctly solves the captcha, they are directed to a page which reads simply “You have been blocked.” There is a fake contact form at the bottom of the page, which submits appeals into a black hole.

    Here’s an example of the block page. This user is connecting from a proxy, so the block is expected, but DataDome is known to block residential IP addresses arbitrarily.


  • NTFS is considered pretty stable on Linux now. It should be safe to use indefinitely.

    If you’re worried about the lack of Unix-style permissions and attributes in NTFS, then getting BTRFS or ext4 on Windows may be a good choice. Note that BTRFS is much more complicated than ext4, so ext4 may have better compatibility and lower risk of corruption. I used ext3 on Windows in 2007 and it was very reliable; ext4 today is very similar to ext3 from those days.

    The absolute best compatibility would come from using a filesystem natively supported by both operating systems, developed without reverse engineering. That leaves only vfat (aka FAT32) and exfat. Both lack Unix-style permissions and attributes.




  • Can someone explain to me how this is economical? (The article is pretty light on facts, and the few facts that it has are suspect anyway due to the article’s technical mistakes, like measuring capacity in “megawatts”.)

    The maximum price of electricity (that I could find) in California is $0.66/kWh . That means, if you charge at night, or at some theoretical time when electricity is free, and then sell at that maximum price every day, your round-trip profit is $0.66 for each kWh of battery capacity. Lithium-ion batteries, if I’m being generous, last up to 2000 charge cycles. Let’s say they don’t lose any capacity during that time, either. That means your profit $1320 per kWh, for the whole life of the battery.

    The cheapest grid-tie batteries I can find are about $3000 per kWh, so about twice as much as the total lifetime profit.

    Is there something I’m missing?


  • Sorry if this isn’t what you’re looking for, but my answer is basically “no”.

    I can take a 10mg Adderall 4 hours before bed, and fall right asleep. Sometimes, I can take a 10mg Adderall in the morning, and fall asleep at my desk at work, only 30 minutes later.

    Adderall makes me feel relaxed and totally unstressed. I’ve never had HRV stress measured, though. What is the experience like, to you, when you are having high HRV stress levels?

    Wellbutrin and most other SSRI’s and SNRI’s make me feel a little TOO relaxed. Some of them make me feel less conscious, and a little bit brain fogged. At the time, I described it as if my soul was detached from my body.

    To me, methylphenidate (Ritalin) gives the same effects as Adderall.