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#!/bin/bash
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#
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# This script reads it's configuration from /etc/sysconfig/raid-check
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# Please use that file to enable/disable this script or to set the
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# type of check you wish performed.
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# We might be on a kernel with no raid support at all, exit if so
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[ -f /proc/mdstat ] || exit 0
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# and exit if we haven't been set up properly
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[ -f /etc/sysconfig/raid-check ] || exit 0
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. /etc/sysconfig/raid-check
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# Wait until no more than arg1 arrays in arg2 list are busy
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waitbusy() {
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local threshold=$(($1 + 1))
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local dev_list="$2"
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while true
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do
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local busy=0
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local dev=""
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for dev in $dev_list; do
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local sync_action=`cat /sys/block/$dev/md/sync_action`
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if [ "$sync_action" != "idle" ]; then
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let busy++
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fi
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done
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[ $busy -lt $threshold ] && break
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sleep 60
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done
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}
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[ "$ENABLED" != "yes" ] && exit 0
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case "$CHECK" in
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check) ;;
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repair) ;;
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*) exit 0;;
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esac
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ionice=""
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renice=""
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case $NICE in
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high)
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renice="-n -5"
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;;
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low)
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renice="-n 5"
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ionice="-c2 -n7"
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;;
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idle)
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renice="-n 15"
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ionice="-c3"
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;;
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*)
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;;
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esac
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active_list=`grep "^md.*: active" /proc/mdstat | cut -f 1 -d ' '`
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[ -z "$active_list" ] && exit 0
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declare -A check
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dev_list=""
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check_list=""
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for dev in $active_list; do
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echo $SKIP_DEVS | grep -w $dev >&/dev/null && continue
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if [ -f /sys/block/$dev/md/sync_action ]; then
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# Only perform the checks on idle, healthy arrays, but delay
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# actually writing the check field until the next loop so we
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# don't switch currently idle arrays to active, which happens
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# when two or more arrays are on the same physical disk
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array_state=`cat /sys/block/$dev/md/array_state`
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if [ "$array_state" != "clean" -a "$array_state" != "active" ]; then
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continue
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fi
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sync_action=`cat /sys/block/$dev/md/sync_action`
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if [ "$sync_action" != idle ]; then
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continue
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fi
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ck=""
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echo $REPAIR_DEVS | grep -w $dev >&/dev/null && ck="repair"
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echo $CHECK_DEVS | grep -w $dev >&/dev/null && ck="check"
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[ -z "$ck" ] && ck=$CHECK
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dev_list="$dev_list $dev"
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check[$dev]=$ck
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[ "$ck" = "check" ] && check_list="$check_list $dev"
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fi
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done
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[ -z "$dev_list" ] && exit 0
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for dev in $dev_list; do
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#Only run $MAXCONCURRENT checks at a time
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if [ -n "$MAXCONCURRENT" ]; then
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waitbusy $((MAXCONCURRENT - 1)) "$dev_list"
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fi
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echo "${check[$dev]}" > /sys/block/$dev/md/sync_action
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resync_pid=""
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wait=10
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while [ $wait -gt 0 -a -z "$resync_pid" ]; do
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sleep 6
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let wait--
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resync_pid=$(ps -ef | awk -v mddev=$dev 'BEGIN { pattern = "^\\[" mddev "_resync]$" } $8 ~ pattern { print $2 }')
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done
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[ -n "$resync_pid" -a -n "$renice" ] &&
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renice $renice -p $resync_pid >&/dev/null
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[ -n "$resync_pid" -a -n "$ionice" ] &&
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ionice $ionice -p $resync_pid >&/dev/null
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done
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[ -z "$check_list" ] && exit 0
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waitbusy 0 "$check_list"
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for dev in $check_list; do
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mismatch_cnt=`cat /sys/block/$dev/md/mismatch_cnt`
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# Due to the fact that raid1/10 writes in the kernel are unbuffered,
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# a raid1 array can have non-0 mismatch counts even when the
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# array is healthy. These non-0 counts will only exist in
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# transient data areas where they don't pose a problem. However,
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# since we can't tell the difference between a non-0 count that
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# is just in transient data or a non-0 count that signifies a
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# real problem, simply don't check the mismatch_cnt on raid1
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# devices as it's providing far too many false positives. But by
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# leaving the raid1 device in the check list and performing the
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# check, we still catch and correct any bad sectors there might
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# be in the device.
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raid_lvl=`cat /sys/block/$dev/md/level`
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if [ "$raid_lvl" = "raid1" -o "$raid_lvl" = "raid10" ]; then
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continue
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fi
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if [ "$mismatch_cnt" -ne 0 ]; then
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echo "WARNING: mismatch_cnt is not 0 on /dev/$dev"
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fi
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done
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