3 ms·

Man, reading this just makes me wonder again why -c (checksum) isn't the default in rsync by now, especially with SSDs everywhere. Is it really just about that

• 0rzech 1y ago
  Checksums are slow on HDDs and using SSDs for backups is a bad idea, particularly for cold backups, due to data longevity and the tendency for SSDs to experience sudden total failures instead of gradual degradation.
  • Aachen 1y ago
    The -c makes it do more reads, though, not unnecessary writes Degradation won't get worse except when a file changed without metadata having been modified, but then that's exactly what you want
    • 0rzech 1y ago
      Yes, but it's orthogonal to my comment.
• kissgyorgy 1y ago
  It's not a tiny bit at all. For checksum, the whole file need to be read beforehand, the metadata is just a quick lookup. It's order of magnitude slower and eats I/O too.
• account42 1y ago
  Because changing the defaults of command-line tools is generally a shitty thing to do. And the speed difference is only tiny for tiny files.