#!/bin/bash # # This script reads it's configuration from /etc/sysconfig/raid-check # Please use that file to enable/disable this script or to set the # type of check you wish performed. # We might be on a kernel with no raid support at all, exit if so [ -f /proc/mdstat ] || exit 0 # and exit if we haven't been set up properly [ -f /etc/sysconfig/raid-check ] || exit 0 . /etc/sysconfig/raid-check [ "$ENABLED" != "yes" ] && exit 0 case "$CHECK" in check) ;; repair) ;; *) exit 0;; esac active_list=`grep "^md.*: active" /proc/mdstat | cut -f 1 -d ' '` [ -z "$active_list" ] && exit 0 declare -A check dev_list="" check_list="" for dev in $active_list; do echo $SKIP_DEVS | grep -w $dev >/dev/null 2>&1 && continue if [ -f /sys/block/$dev/md/sync_action ]; then # Only perform the checks on idle, healthy arrays, but delay # actually writing the check field until the next loop so we # don't switch currently idle arrays to active, which happens # when two or more arrays are on the same physical disk array_state=`cat /sys/block/$dev/md/array_state` sync_action=`cat /sys/block/$dev/md/sync_action` if [ "$array_state" = clean -a "$sync_action" = idle ]; then ck="" echo $REPAIR_DEVS | grep -w $dev >/dev/null 2>&1 && ck="repair" echo $CHECK_DEVS | grep -w $dev >/dev/null 2>&1 && ck="check" [ -z "$ck" ] && ck=$CHECK dev_list="$dev_list $dev" check[$dev]=$ck [ "$ck" = "check" ] && check_list="$check_list $dev" fi fi done [ -z "$dev_list" ] && exit 0 for dev in $dev_list; do echo "${check[$dev]}" > /sys/block/$dev/md/sync_action done [ -z "$check_list" ] && exit 0 checking=1 while [ $checking -ne 0 ] do sleep 60 checking=0 for dev in $check_list; do sync_action=`cat /sys/block/$dev/md/sync_action` if [ "$sync_action" != "idle" ]; then checking=1 fi done done for dev in $check_list; do mismatch_cnt=`cat /sys/block/$dev/md/mismatch_cnt` # Due to the fact that raid1 writes in the kernel are unbuffered, # a raid1 array can have non-0 mismatch counts even when the # array is healthy. These non-0 counts will only exist in # transient data areas where they don't pose a problem. However, # since we can't tell the difference between a non-0 count that # is just in transient data or a non-0 count that signifies a # real problem, simply don't check the mismatch_cnt on raid1 # devices as it's providing far too many false positives. But by # leaving the raid1 device in the check list and performing the # check, we still catch and correct any bad sectors there might # be in the device. raid_lvl=`cat /sys/block/$dev/md/level` if [ "$mismatch_cnt" -ne 0 -a "$raid_lvl" != "raid1" ]; then echo "WARNING: mismatch_cnt is not 0 on /dev/$dev" fi done