diff --git a/services/baremetal-builder/default.nix b/services/baremetal-builder/default.nix
index ee3dbdf..9bca15f 100644
--- a/services/baremetal-builder/default.nix
+++ b/services/baremetal-builder/default.nix
@@ -60,7 +60,10 @@ in
     fileSystems."/mnt" = {
       device = "/dev/disk/by-label/hydra";
       fsType = "xfs";
+      options = ["logbsize=256k"];
     };
+    boot.kernel.sysctl."fs.xfs.xfssyncd_centisecs" = "12000";
+
     # We want the tmp filesystem on the same filesystem as the hydra store, so that builds can use reflinks
     fileSystems."/tmp" = {
       device = "/mnt/tmp";