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servo: zfs: enable reflink support

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Colin 2024-03-31 03:48:34 +00:00
parent c9632b05f9
commit d3ad661970
1 changed files with 8 additions and 1 deletions
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9
hosts/by-name/servo/fs.nix
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@ -26,6 +26,7 @@
# scrub all zfs pools weekly:
services.zfs.autoScrub.enable = true;
boot.extraModprobeConfig = ''
### zfs_arc_max tunable:
# ZFS likes to use half the ram for its own cache and let the kernel push everything else to swap.
# so, reduce its cache size
# see: <https://askubuntu.com/a/1290387>
@ -34,7 +35,13 @@
# for all tunables, see: `man 4 zfs`
# to update these parameters without rebooting:
# - `echo '4294967296' | sane-sudo-redirect /sys/module/zfs/parameters/zfs_arc_max`
options zfs zfs_arc_max=4294967296
### zfs_bclone_enabled tunable
# this allows `cp --reflink=always FOO BAR` to work. i.e. shallow copies.
# it's unstable as of 2.2.3. led to *actual* corruption in 2.2.1, but hopefully better by now.
# - <https://github.com/openzfs/zfs/issues/405>
# note that `du -h` won't *always* show the reduced size for reflink'd files (?).
# `zpool get all | grep clone` seems to be the way to *actually* see how much data is being deduped
options zfs zfs_arc_max=4294967296 zfs_bclone_enabled=1
'';
# to be able to mount the pool like this, make sure to tell zfs to NOT manage it itself.
# otherwise local-fs.target will FAIL and you will be dropped into a rescue shell.