From 514ccb4258b9810f899ceacc0cb6d6485bcbee1f Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@proton.me>
Date: Tue, 3 Mar 2026 15:05:59 -0500
Subject: [PATCH] postgresql: disable full_page_writes

---
 services/postgresql.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/services/postgresql.nix b/services/postgresql.nix
index 474ebe2..3fb4463 100644
--- a/services/postgresql.nix
+++ b/services/postgresql.nix
@@ -19,6 +19,14 @@
     enable = true;
     package = pkgs.postgresql_16;
     dataDir = service_configs.postgres.dataDir;
+    settings = {
+      # ZFS provides checksumming and atomic writes, making PostgreSQL's
+      # full_page_writes redundant. Disabling reduces write amplification
+      # and SSD wear on the zpool.
+      # Did this in conjunction with setting recordsize=8k
+      # on the zvolume this is on
+      full_page_writes = false;
+    };
   };
 
 }