Swap max_hw_sectors_kb for max_sectors_kb. Fixes #5633. (#5638)

docs/deployment/kernel-tuning/disk-tuning.sh

@@ -14,6 +14,8 @@
 ## See the License for the specific language governing permissions and
 ## limitations under the License.
 
+# This script changes protected files, and must be run as root
+
 for i in $(ls -d /sys/block/*/queue/iosched 2>/dev/null); do
     iosched_dir=$(echo $i | awk '/iosched/ {print $1}')
     [ -z $iosched_dir ] && {
@@ -42,7 +44,7 @@ for i in $(ls -d /sys/block/*/queue/iosched 2>/dev/null); do
     ## This is the maximum number of kilobytes
     ## supported in a single data transfer at
     ## block layer.
-    [ -f $path/max_hw_sectors_kb ] && {
-        echo "1024" > $path/max_hw_sectors_kb
+    [ -f $path/max_sectors_kb ] && {
+        echo "1024" > $path/max_sectors_kb || true
     }
 done