Original version

set_hdd_erc.sh

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+#!/usr/bin/env bash
+
+# https://www.smartmontools.org/wiki/FAQ#WhatiserrorrecoverycontrolERCandwhyitisimportanttoenableitfortheSATAdisksinRAID
+
+# ERC timeout values, in tenths of a second. The defaults below are 7 seconds for both reads and writes:
+
+readsetting=70
+writesetting=70
+
+# We need a list of the SMART-enabled drives on the system. Choose one of these
+# three methods to provide the list. Comment out the two unused sections of code.
+
+# 1. A string constant; just key in the devices you want to report on here:
+#drives="da1 da2 da3 da4 da5 da6 da7 da8 ada0"
+
+# 2. A systcl-based technique suggested on the FreeNAS forum:
+#drives=$(for drive in $(sysctl -n kern.disks); do \
+#if [ "$(/usr/local/sbin/smartctl -i /dev/${drive} | grep "SMART support is: Enabled" | awk '{print $3}')" ]
+#then printf ${drive}" "; fi done | awk '{for (i=NF; i!=0 ; i--) print $i }')
+
+# 3. A smartctl-based function:
+get_smart_drives()
+{
+  local gs_smartdrives
+  local gs_drives
+  local gs_drive
+  local gs_smart_flag
+
+  gs_drives=$(/usr/local/sbin/smartctl --scan | grep "dev" | awk '{print $1}' | sed -e 's/\/dev\///')
+
+  gs_smartdrives=""
+
+  for gs_drive in $gs_drives 
+    do
+      gs_smart_flag=$(/usr/local/sbin/smartctl -i /dev/"$gs_drive" | grep "SMART support is: Enabled" | awk '{print $4}')
+      if [ "$gs_smart_flag" == "Enabled" ]; then
+        gs_smartdrives=$gs_smartdrives" "${gs_drive}
+      fi
+    done
+
+  eval "$1=\$gs_smartdrives"
+}
+
+declare drives
+get_smart_drives drives
+
+# end of method 3.
+
+set_erc()
+{
+  echo "Drive: /dev/$1"
+  /usr/local/sbin/smartctl -q silent -l scterc,"${readsetting}","${writesetting}" /dev/"$1"
+  /usr/local/sbin/smartctl -l scterc /dev/"$1" | grep "SCT\|Write\|Read"
+}
+
+for drive in $drives; do
+  set_erc "$drive"
+done