# ZFS ARC sizing for glados — a mixed-workload host (32 GB RAM).
#
# Why these numbers:
#  - The cold ZFS pool is BACKUP TIER ONLY. Hot data (MC world, Gitea repos,
#    Directus DB, containers) all live on NVMe LVM, not ZFS — so a large
#    ARC doesn't help any of the actual workloads.
#  - Tier-2 backup work is streaming writes (rsync hot→cold every 4h):
#    streaming writes don't benefit much from cache.
#  - Reads happen rarely (disaster recovery, Gitea LFS fetches), and a
#    one-time cold read is fine.
#  - MC is the memory-hungry workload (10 GB Java heap). Every GB we DON'T
#    give to ARC is a GB more headroom for MC and future content.
#
# 2 GB max / 1 GB min keeps ZFS metadata + small ARC for occasional reads,
# without crowding MC out of RAM.
options zfs zfs_arc_max=2147483648
options zfs zfs_arc_min=1073741824