Add scterc.sh

Add a script to configure SCTERC timeout for all disks, setting it to 7 seconds for improved error handling. If SCTERC is unsupported, it increases the Linux I/O timeout to 180 seconds. Adjusting timeouts prevents premature I/O failures during extended error recovery, improving reliability.

scterc.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+###
+# Set SAS and SATA SCT error timeout.
+#
+# SPDX-License-Identifier: CC0-1.0
+###
+
+sct=70      	# 70=7 seconds
+fallback=180	# 180 seconds
+
+for i in /dev/sd[a-z] ; do
+	device=$(basename "$i")
+
+	# Attempt to set the SCTERC timeout to 7 seconds
+	output=$(smartctl -l scterc,$sct,$sct "$i" 2>&1)
+	
+	# Check the output for "SCT Commands not supported"
+	if echo "$output" | grep -q "SCT Commands not supported" ; then
+		echo $fallback > "/sys/block/${device}/device/timeout"
+		printf "%s is bad  " "$i"
+	else
+		printf "%s is good " "$i"
+	fi
+
+	# Show device identification
+	smartctl -i "$i" | grep -E "(Device Model|Product:)"
+done