zed: update zed.d/statechange-slot_off.sh

The statechange-slot_off.sh zedlet which was added in #15200
needed to be installed so it's included by the packages.

Additional testing has also shown that multiple retries are
often needed for the script to operate reliably.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #15210

cmd/zed/zed.d/Makefile.am

@@ -16,6 +16,7 @@ dist_zedexec_SCRIPTS = \
 	%D%/scrub_finish-notify.sh \
 	%D%/statechange-led.sh \
 	%D%/statechange-notify.sh \
+	%D%/statechange-slot_off.sh \
 	%D%/trim_finish-notify.sh \
 	%D%/vdev_attach-led.sh \
 	%D%/vdev_clear-led.sh
@@ -35,6 +36,7 @@ zedconfdefaults = \
 	scrub_finish-notify.sh \
 	statechange-led.sh \
 	statechange-notify.sh \
+	statechange-slot_off.sh \
 	vdev_attach-led.sh \
 	vdev_clear-led.sh
 

cmd/zed/zed.d/statechange-slot_off.sh

@@ -43,16 +43,18 @@ if [ ! -f "$ZEVENT_VDEV_ENC_SYSFS_PATH/power_status" ] ; then
 	exit 4
 fi
 
+# Turn off the slot and wait for sysfs to report that the slot is off.
+# It can take ~400ms on some enclosures and multiple retries may be needed.
+for i in $(seq 1 20) ; do
 	echo "off" | tee "$ZEVENT_VDEV_ENC_SYSFS_PATH/power_status"
 
-# Wait for sysfs for report that the slot is off.  It can take ~400ms on some
+	for j in $(seq 1 5) ; do
-# enclosures.
-for i in $(seq 1 20) ; do
 		if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" == "off" ] ; then
-		break
+			break 2
 		fi
 		sleep 0.1
 	done
+done
 
 if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" != "off" ] ; then
 	exit 5