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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/degraded, and turn it back off when
# it's healthy again. This 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 built without libdevmapper
[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
. "${ZED_ZEDLET_DIR}/zed-functions.sh"
# ZEVENT_VDEV_UPATH will not be present if ZFS is not built with libdevmapper
[ -n "${ZEVENT_VDEV_UPATH}" ] || exit 3
if [ "${ZED_USE_ENCLOSURE_LEDS}" != "1" ] ; then
exit 2
fi
if [ ! -d /sys/class/enclosure ] ; then
exit 1
fi
# Turn on/off enclosure LEDs
function led
{
name=$1
val=$2
# We want to check the current state first, since writing to the
# 'fault' entry always always causes a SES command, even if the
# current state is already what you want.
if [ -e /sys/block/$name/device/enclosure_device*/fault ] ; then
# We have to do some monkey business to deal with spaces in
# enclosure_device names. I've seen horrible things like this:
#
# '/sys/block/sdfw/device/enclosure_device:SLOT 43 41 /fault'
#
# ...so escape all spaces.
file=`ls /sys/block/$name/device/enclosure_device*/fault | sed 's/\s/\\ /g'`
current=`cat "$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
fi
}
# Decide whether to turn on/off an LED based on the state
# Pass in path name and fault string ("ONLINE"/"FAULTED"/"DEGRADED"...etc)
function process {
# path=/dev/sda, fault=
path=$1
fault=$2
name=`basename $path`
if [ -z "$name" ] ; then
return
fi
if [ "$fault" == "FAULTED" ] || [ "$fault" == "DEGRADED" ] ; then
led $name 1
else
led $name 0
fi
}
process "$ZEVENT_VDEV_UPATH" "$ZEVENT_VDEV_STATE_STR"
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