this post was submitted on 20 Sep 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I had bcache + btrfs (RAID1) before this but it was a huge waste of space because bcache had to cache two identical copies of the data in order to be effective (since BTRFS and bcache don't communicate and BTRFS picks from a random disk); that's half as much cache.
With Bcachefs everything is integrated so it knows to cache only one copy in RAID1 (and it doesn't even need to hold two HDD copies, the fast/"cached" copy counts). Data is read from the fastest source and every resource is best utilized.
Nice.