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docs: btrfs: note that btrfs hook doesn't cache even with runtime dir

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Jackson
2025-11-21 05:17:44 +01:00
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docs/reference/configuration/data-sources/btrfs.md
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@@ -76,6 +76,14 @@ next, the [Borg file
cache](https://borgbackup.readthedocs.io/en/stable/internals/data-structures.html#cache)
will never get cache hits on snapshotted files. This makes backing up Btrfs
snapshots a little slower than non-snapshotted files that have consistent paths.
**It is also not possible to mitigate cache misses**, as the Btrfs hook uses
snapshot paths which change between borgmatic invocations, and the snapshots
are located outside the [runtime
directory](https://torsion.org/borgmatic/reference/configuration/runtime-directory/),
contrary to
[ZFS](https://torsion.org/borgmatic/reference/configuration/data-sources/zfs/#performance)
and
[LVM](https://torsion.org/borgmatic/reference/configuration/data-sources/lvm/#performance).
<span class="minilink minilink-addedin">With Borg version 2.x</span> Even
snapshotted files should get cache hits, because Borg 2.x is smarter about how