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#!/bin/sh
#
# Turn off disk's enclosure slot if it becomes FAULTED.
#
# Bad SCSI disks can often "disappear and reappear" causing all sorts of chaos
# as they flip between FAULTED and ONLINE. If
# ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT is set in zed.rc, and the disk gets
# FAULTED, then power down the slot via sysfs:
#
# /sys/class/enclosure/<enclosure>/<slot>/power_status
#
# We assume the user will be responsible for turning the slot back on again.
#
# Note that 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.
#
# Exit codes:
# 0: slot successfully powered off
# 1: enclosure not available
# 2: ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT disabled
# 3: vdev was not FAULTED
# 4: The enclosure sysfs path passed from ZFS does not exist
# 5: Enclosure slot didn't actually turn off after we told it to
[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
. "${ZED_ZEDLET_DIR}/zed-functions.sh"
if [ ! -d /sys/class/enclosure ] ; then
# No JBOD enclosure or NVMe slots
exit 1
fi
if [ "${ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT}" != "1" ] ; then
exit 2
fi
if [ "$ZEVENT_VDEV_STATE_STR" != "FAULTED" ] ; then
exit 3
fi
if [ ! -f "$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"
for j in $(seq 1 5) ; do
if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" == "off" ] ; then
break 2
fi
sleep 0.1
done
done
if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" != "off" ] ; then
exit 5
fi
zed_log_msg "powered down slot $ZEVENT_VDEV_ENC_SYSFS_PATH for $ZEVENT_VDEV_PATH"
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