diff --git a/modules/monitoring.nix b/modules/monitoring.nix
index 1723107..d05f343 100644
--- a/modules/monitoring.nix
+++ b/modules/monitoring.nix
@@ -15,6 +15,44 @@
       echo "zpool_health,pool=$pool health=''${val}i"
     done
   '';
+
+  # Telegraf's inputs.smart parses SATA/NVMe attribute tables but not the
+  # SAS-specific sections of `smartctl -a` output. This script extracts the
+  # SAS predictive failure metrics that the SMART plugin misses.
+  sasSmartScript = pkgs.writeShellScript "sas-smart" ''
+    set -u
+    for dev in /dev/sd?; do
+      [ -b "$dev" ] || continue
+      out=$(${pkgs.sudo}/bin/sudo ${pkgs.smartmontools}/bin/smartctl -a "$dev" 2>/dev/null) || continue
+
+      # Only SAS drives — skip if not SAS
+      echo "$out" | ${pkgs.gnugrep}/bin/grep -q "Transport protocol:.*SAS" || continue
+
+      name=$(basename "$dev")
+
+      poh=$(echo "$out" | ${pkgs.gnugrep}/bin/grep "Accumulated power on time" | ${pkgs.gawk}/bin/awk '{print $6}' | ${pkgs.coreutils}/bin/cut -d: -f1)
+      grown_defects=$(echo "$out" | ${pkgs.gnugrep}/bin/grep "Elements in grown defect list" | ${pkgs.gawk}/bin/awk -F: '{gsub(/ /,"",$2); print $2}')
+      [ -z "$grown_defects" ] && grown_defects=$(echo "$out" | ${pkgs.gnugrep}/bin/grep "Grown defects during certification" | ${pkgs.gawk}/bin/awk -F= '{gsub(/ /,"",$2); print $2}')
+      non_medium=$(echo "$out" | ${pkgs.gnugrep}/bin/grep "Non-medium error count" | ${pkgs.gawk}/bin/awk -F: '{gsub(/ /,"",$2); print $2}')
+      pending=$(echo "$out" | ${pkgs.gnugrep}/bin/grep "Pending defect count" | ${pkgs.gawk}/bin/awk '{print $4}')
+
+      # ECC errors corrected (read/write) — last column of the totals row
+      read_uncorr=$(echo "$out" | ${pkgs.gnugrep}/bin/grep -A1 "^read:" | ${pkgs.coreutils}/bin/head -1 | ${pkgs.gawk}/bin/awk '{print $NF}')
+      write_uncorr=$(echo "$out" | ${pkgs.gnugrep}/bin/grep -A1 "^write:" | ${pkgs.coreutils}/bin/head -1 | ${pkgs.gawk}/bin/awk '{print $NF}')
+
+      fields=""
+      [ -n "''${poh:-}" ] && fields="$fields,power_on_hours=''${poh}i"
+      [ -n "''${grown_defects:-}" ] && fields="$fields,grown_defects=''${grown_defects}i"
+      [ -n "''${non_medium:-}" ] && fields="$fields,non_medium_errors=''${non_medium}i"
+      [ -n "''${pending:-}" ] && fields="$fields,pending_defects=''${pending}i"
+      [ -n "''${read_uncorr:-}" ] && fields="$fields,read_uncorrected=''${read_uncorr}i"
+      [ -n "''${write_uncorr:-}" ] && fields="$fields,write_uncorrected=''${write_uncorr}i"
+
+      if [ -n "$fields" ]; then
+        echo "smart_sas,device=$name ''${fields#,}"
+      fi
+    done
+  '';
 in {
   options.skyworks.monitoring = {
     enable = lib.mkEnableOption "Telegraf monitoring to InfluxDB";
@@ -81,12 +119,20 @@
             use_sudo = true;
             attributes = true;
           }];
-          exec = [{
-            commands = [ "${zpoolHealthScript}" ];
-            interval = "60s";
-            timeout = "10s";
-            data_format = "influx";
-          }];
+          exec = [
+            {
+              commands = [ "${zpoolHealthScript}" ];
+              interval = "60s";
+              timeout = "10s";
+              data_format = "influx";
+            }
+            {
+              commands = [ "${sasSmartScript}" ];
+              interval = "30m";
+              timeout = "60s";
+              data_format = "influx";
+            }
+          ];
         };
       };
     };