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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. -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 with /proc/mdstat file." } SHORTOPTS=achVqQsxilf LONGOPTS=all,cron,help,version,quiet,real-quiet,status,cancel,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;; -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 $array." >&2 ;; check) if [ "$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 array. echo $action > $MDBASE/sync_action [ $quiet -lt 1 ] && echo "$PROGNAME: I: check 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