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#!/bin/sh
#
# checkarray -- initiates a check run of an MD array's redundancy information.
#
# Copyright © martin f. krafft <madduck@debian.org>
# distributed under the terms of the Artistic Licence 2.0
#
set -eu
PROGNAME=${0##*/}
about()
{
echo "\
$PROGNAME -- MD array (RAID) redundancy checker tool
Copyright © martin f. krafft <madduck@debian.org>
Released under the terms of the Artistic Licence 2.0"
}
usage()
{
about
echo "
Usage: $PROGNAME [options] [arrays]
Valid options are:
-a|--all check all assembled arrays (ignores arrays in command line).
-s|--status print redundancy check status of devices.
-x|--cancel queue a request to cancel a running redundancy check.
-r|--repair repair instead of check
-i|--idle perform check in a lowest scheduling class (idle)
-l|--slow perform check in a lower-than-standard scheduling class
-f|--fast perform check in higher-than-standard scheduling class
--realtime perform check in real-time scheduling class (DANGEROUS!)
-c|--cron honour AUTOCHECK setting in /etc/default/mdadm.
-q|--quiet suppress informational messages
(use twice to suppress error messages too).
-h|--help show this output.
-V|--version show version information.
Examples:
$PROGNAME --all --idle
$PROGNAME --quiet /dev/md[123]
$PROGNAME -sa
$PROGNAME -x --all
Devices can be specified in almost any format. The following are equivalent:
/dev/md0, md0, /dev/md/0, /sys/block/md0
You can also control the status of a check/repair with /proc/mdstat file."
}
SHORTOPTS=achVqQsxrilf
LONGOPTS=all,cron,help,version,quiet,real-quiet,status,cancel,repair,idle,slow,fast,realtime
eval set -- $(getopt -o $SHORTOPTS -l $LONGOPTS -n $PROGNAME -- "$@")
arrays=''
cron=0
all=0
quiet=0
status=0
action=check
ionice=
for opt in $@; do
case "$opt" in
-a|--all) all=1;;
-s|--status) action=status;;
-x|--cancel) action=idle;;
-r|--repair) action=repair;;
-i|--idle) ionice=idle;;
-l|--slow) ionice=low;;
-f|--fast) ionice=high;;
--realtime) ionice=realtime;;
-c|--cron) cron=1;;
-q|--quiet) quiet=$(($quiet+1));;
-Q|--real-quiet) quiet=$(($quiet+2));; # for compatibility
-h|--help) usage; exit 0;;
-V|--version) about; exit 0;;
/dev/md/*|md/*) arrays="${arrays:+$arrays }md${opt#*md/}";;
/dev/md*|md*) arrays="${arrays:+$arrays }${opt#/dev/}";;
/sys/block/md*) arrays="${arrays:+$arrays }${opt#/sys/block/}";;
--) :;;
*) echo "$PROGNAME: E: invalid option: $opt. Try --help." >&2; exit 1;;
esac
done
is_true()
{
case "${1:-}" in
[Yy]es|[Yy]|1|[Tt]rue|[Tt]) return 0;;
*) return 1;
esac
}
DEBIANCONFIG=/etc/default/mdadm
[ -r $DEBIANCONFIG ] && . $DEBIANCONFIG
if [ $cron = 1 ] && ! is_true ${AUTOCHECK:-false}; then
[ $quiet -lt 1 ] && echo "$PROGNAME: I: disabled in $DEBIANCONFIG ." >&2
exit 0
fi
if [ ! -f /proc/mdstat ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: E: MD subsystem not loaded, or /proc unavailable." >&2
exit 2
fi
if [ ! -d /sys/block ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: E: /sys filesystem not available." >&2
exit 7
fi
if [ -z "$(ls /sys/block/md* 2>/dev/null)" ]; then
if [ $quiet -lt 2 ] && [ $cron != 1 ]; then
echo "$PROGNAME: W: no active MD arrays found." >&2
echo "$PROGNAME: W: (maybe uninstall the mdadm package?)" >&2
fi
exit 0
fi
if [ -z "$(ls /sys/block/md*/md/level 2>/dev/null)" ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: E: kernel too old, no support for redundancy checks." >&2
exit 6
fi
if ! egrep -q '^raid([1456]|10)$' /sys/block/md*/md/level 2>/dev/null; then
[ $quiet -lt 1 ] && echo "$PROGNAME: I: no redundant arrays present; skipping checks..." >&2
exit 0
fi
if [ -z "$(ls /sys/block/md*/md/sync_action 2>/dev/null)" ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: E: no kernel support for redundancy checks." >&2
exit 3
fi
[ $all = 1 ] && arrays="$(ls -d1 /sys/block/md* | cut -d/ -f4)"
for array in $arrays; do
MDBASE=/sys/block/$array/md
if [ ! -e $MDBASE/sync_action ]; then
[ $quiet -lt 1 ] && echo "$PROGNAME: I: skipping non-redundant array $array." >&2
continue
fi
cur_status="$(cat $MDBASE/sync_action)"
if [ $action = status ]; then
echo "$array: $cur_status"
continue
fi
if [ ! -w $MDBASE/sync_action ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: E: $MDBASE/sync_action not writeable." >&2
exit 4
fi
if [ "$(cat $MDBASE/array_state)" = 'read-auto' ]; then
[ $quiet -lt 1 ] && echo "$PROGNAME: W: array $array in auto-read-only state, skipping..." >&2
continue
fi
case "$action" in
idle)
echo $action > $MDBASE/sync_action
[ $quiet -lt 1 ] && echo "$PROGNAME: I: cancel request queued for array $array." >&2
;;
check|repair)
if [ "$cur_status" != idle ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: W: array $array not idle, skipping..." >&2
continue
fi
# check if the array created recently and skip test if it is
created=$(mdadm --detail /dev/$array 2>/dev/null |
sed -n 's/.*Creation Time *://p' )
if [ -n "$created" ]; then
created=$(date +%s -d "$created" 2>/dev/null)
fi
if [ -n "$created" ]; then
now=$(date +%s)
if [ "$created" -lt "$now" -a \
"$created" -gt "$(($now - 14 * 24 * 60 * 60))" ]; then
[ $quiet -lt 2 ] && echo "$PROGNAME: I: array $array created recently, skipping..." >&2
continue
fi
fi
# queue request for the array. The kernel will make sure that these requests
# are properly queued so as to not kill one of the arrays.
echo $action > $MDBASE/sync_action
[ $quiet -lt 1 ] && echo "$PROGNAME: I: $action queued for array $array." >&2
case "$ionice" in
idle) ioarg='-c3'; renice=15;;
low) ioarg='-c2 -n7'; renice=5;;
high) ioarg='-c2 -n0'; renice=0;;
realtime) ioarg='-c1 -n4'; renice=-5;;
*) continue;;
esac
resync_pid= wait=5
while [ $wait -gt 0 ]; do
wait=$((wait - 1))
resync_pid=$(ps -ef | awk -v dev=$array 'BEGIN { pattern = "^\\[" dev "_resync]$" } $8 ~ pattern { print $2 }')
if [ -n "$resync_pid" ]; then
[ $quiet -lt 1 ] && echo "$PROGNAME: I: selecting $ionice I/O scheduling class and $renice niceness for resync of $array." >&2
ionice -p "$resync_pid" $ioarg 2>/dev/null || :
renice -n $renice -p "$resync_pid" 1>/dev/null 2>&1 || :
break
fi
sleep 1
done
;;
esac
done
exit 0