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zed: Add zedlet to power off slot when drive is faulted

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If ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT is enabled in zed.rc, then
power off the drive's slot in the enclosure if it becomes FAULTED.
This can help silence misbehaving drives.  This assumes your drive
enclosure fully supports slot power control via sysfs.

Reviewed-by: @AllKind
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #15200
This commit is contained in:
Tony Hutter 2023-08-24 11:59:03 -07:00 committed by Brian Behlendorf
parent 92f095a903
commit d19304ffee
2 changed files with 66 additions and 0 deletions
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61
cmd/zed/zed.d/statechange-slot_off.sh Executable file
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@ -0,0 +1,61 @@
#!/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
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
# enclosures.
for i in $(seq 1 20) ; do
if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" == "off" ] ; then
break
fi
sleep 0.1
done
if [ "$(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"

5
cmd/zed/zed.d/zed.rc
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@ -142,3 +142,8 @@ ZED_SYSLOG_SUBCLASS_EXCLUDE="history_event"
# Disabled by default, 1 to enable and 0 to disable.
#ZED_SYSLOG_DISPLAY_GUIDS=1
##
# Power off the drive's slot in the enclosure if it becomes FAULTED. This can
# help silence misbehaving drives. This assumes your drive enclosure fully
# supports slot power control via sysfs.
#ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT=1