tmpfiles.d/journal-nocow.conf

   1 #  This file is part of systemd.
   2 #
   3 #  systemd is free software; you can redistribute it and/or modify it
   4 #  under the terms of the GNU Lesser General Public License as published by
   5 #  the Free Software Foundation; either version 2.1 of the License, or
   6 #  (at your option) any later version.
   7
   8 # See tmpfiles.d(5) for details
   9
  10 # Set the NOCOW attribute for directories of journal files. This flag
  11 # is inherited by their new files and sub-directories. Matters only
  12 # for btrfs filesystems.
  13 #
  14 # WARNING: Enabling the NOCOW attribute improves journal performance
  15 #     substantially, but also disables the btrfs checksum logic. In
  16 #     btrfs RAID filesystems the checksums are needed for rebuilding
  17 #     corrupted files. Without checksums such rebuilds are not
  18 #     possible.
  19 #
  20 # In a single-disk filesystem (or a filesystem without redundancy)
  21 # enabling the NOCOW attribute for journal files is safe, because
  22 # they have their own checksums and a rebuilding wouldn't be possible
  23 # in any case.
  24
  25 h /var/log/journal - - - - +C
  26 h /var/log/journal/%m - - - - +C
  27 h /var/log/journal/remote - - - - +C