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#!/bin/bash
#
# Turn off/on the VDEV's enclosure fault LEDs when the pool's state changes.
#
# Turn LED on if the VDEV becomes faulted or degraded, and turn it back off
# when it's online again. It will also turn on the LED (or keep it on) if
# the drive becomes unavailable, unless the drive was in was a previously
# online state (online->unavail is a normal state transition during an
# autoreplace).
#
# This script requires that your enclosure be supported by the
# Linux SCSI enclosure services (ses) driver. The script will do nothing
# if you have no enclosure, or if your enclosure isn't supported.
#
# This script also requires ZFS to be built with libdevmapper support.
#
# Exit codes:
# 0: enclosure led successfully set
# 1: enclosure leds not not available
# 2: enclosure leds administratively disabled
# 3: ZED didn't pass enclosure sysfs path
# 4: Enclosure sysfs path doesn't exist
[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
. "${ZED_ZEDLET_DIR}/zed-functions.sh"
if [ ! -d /sys/class/enclosure ] ; then
exit 1
fi
if [ "${ZED_USE_ENCLOSURE_LEDS}" != "1" ] ; then
exit 2
fi
[ -n "${ZEVENT_VDEV_ENC_SYSFS_PATH}" ] || exit 3
[ -e "${ZEVENT_VDEV_ENC_SYSFS_PATH}/fault" ] || exit 4
# Turn on/off enclosure LEDs
function led
{
file="$1/fault"
val=$2
# We want to check the current state first, since writing to the
# 'fault' entry always always causes a SES command, even if the
# current state is already what you want.
current=$(cat "${file}")
# On some enclosures if you write 1 to fault, and read it back,
# it will return 2. Treat all non-zero values as 1 for
# simplicity.
if [ "$current" != "0" ] ; then
current=1
fi
if [ "$current" != "$val" ] ; then
# Set the value twice. I've seen enclosures that were
# flakey about setting it the first time.
echo "$val" > "$file"
echo "$val" > "$file"
fi
}
# Decide whether to turn on/off an LED based on the state
# Pass in path name and fault string ("ONLINE"/"FAULTED"/"DEGRADED"...etc)
#
# We only turn on LEDs when a drive becomes FAULTED, DEGRADED, or UNAVAIL and
# only turn it on when it comes back ONLINE. All other states are ignored, and
# keep the previous LED state.
function process {
path="$1"
fault=$2
prev=$3
if [ "$fault" == "FAULTED" ] || [ "$fault" == "DEGRADED" ] ; then
led "$path" 1
elif [ "$fault" == "UNAVAIL" ] && [ "$prev" != "ONLINE" ] ; then
# For the most part, UNAVAIL should turn on the LED. However,
# during an autoreplace, we see our new drive go online,
# followed by our "old" drive going ONLINE->UNAVAIL. Since the
# "old" drive has the same slot information, we want to ignore
# the ONLINE->UNAVAIL event.
#
# NAME STATE READ WRITE CKSUM
# mypool3 DEGRADED 0 0 0
# mirror-0 DEGRADED 0 0 0
# A1 ONLINE 0 0 0
# A2 ONLINE 0 880 0
# replacing-3 UNAVAIL 0 0 0
# old UNAVAIL 0 2.93K 0 corrupted data
# A3 ONLINE 0 0 156 (resilvering)
led "$path" 1
elif [ "$fault" == "ONLINE" ] ; then
led "$path" 0
fi
}
process "$ZEVENT_VDEV_ENC_SYSFS_PATH" "$ZEVENT_VDEV_STATE_STR" \
"$ZEVENT_VDEV_LASTSTATE_STR"
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