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Would BtrFS mix well with BCache? Does anyone recommend it if I want zSTD compression? Otherwise, what compression options does BCacheFS offer? Is BCacheFS sta

• bitbang 9y ago
  I have been using a BCache (SSD) in front of a BtrFS Native RAID (HDD) for quite a while without issue.
• rogerbinns 9y ago
  TLDR: I do not recommend using bcache with btrfs, but this is a sample of 1. I've been using bcache (SSD) with btrfs (4TB hard drive) for while, and am in the process of ripping it out. What I found is the filesystem gets wedged if there is a heavy write load (lots of files) such as running debootstrap. This happened with both write-through and write-back. The symptoms are all requests stall and a kernel log message about hung btrfs tasks. Only a reboot (typically needing sysrq keys to complete) works. The problem did not occur previously when using btrfs without bcache and the same workload. It also doesn't occur during "lighter" workloads.
• ConfucianNardin 9y ago
  See under the status headline on http://bcachefs.org/ http://bcachefs.org/ and decide for yourself whether that's good enough for your use case.
  • rogerbinns 9y ago
    Wrong filesystem. bcache is the one that sits in front of another filesystem, and improves its performance. bcachefs (your link) is from the same author, but is a standalone filesystem. https://en.wikipedia.org/wiki/Bcache https://en.wikipedia.org/wiki/Bcache
    • DiThi 9y ago
      I've asked about both, but it's always good to clear things out.