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#!/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
# Wait until no more than arg1 arrays in arg2 list are busy
waitbusy() {
local threshold=$(($1 + 1))
local dev_list="$2"
while true
do
local busy=0
local dev=""
for dev in $dev_list; do
local sync_action=`cat /sys/block/$dev/md/sync_action`
if [ "$sync_action" != "idle" ]; then
let busy++
fi
done
[ $busy -lt $threshold ] && break
sleep 60
done
}
[ "$ENABLED" != "yes" ] && exit 0
case "$CHECK" in
check) ;;
repair) ;;
*) exit 0;;
esac
ionice=""
renice=""
case $NICE in
high)
renice="-n -5"
;;
low)
renice="-n 5"
ionice="-c2 -n7"
;;
idle)
renice="-n 15"
ionice="-c3"
;;
*)
;;
esac
active_list=`grep "^md.*: active" /proc/mdstat | cut -f 1 -d ' '`
[ -z "$active_list" ] && exit 0
declare -A check
dev_list=""
check_list=""
for dev in $active_list; do
echo $SKIP_DEVS | grep -w $dev >&/dev/null && continue
if [ -f /sys/block/$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/$dev/md/array_state`
if [ "$array_state" != "clean" -a "$array_state" != "active" ]; then
continue
fi
sync_action=`cat /sys/block/$dev/md/sync_action`
if [ "$sync_action" != idle ]; then
continue
fi
ck=""
echo $REPAIR_DEVS | grep -w $dev >&/dev/null && ck="repair"
echo $CHECK_DEVS | grep -w $dev >&/dev/null && ck="check"
[ -z "$ck" ] && ck=$CHECK
dev_list="$dev_list $dev"
check[$dev]=$ck
[ "$ck" = "check" ] && check_list="$check_list $dev"
fi
done
[ -z "$dev_list" ] && exit 0
for dev in $dev_list; do
#Only run $MAXCONCURRENT checks at a time
if [ -n "$MAXCONCURRENT" ]; then
waitbusy $((MAXCONCURRENT - 1)) "$dev_list"
fi
echo "${check[$dev]}" > /sys/block/$dev/md/sync_action
resync_pid=""
wait=10
while [ $wait -gt 0 -a -z "$resync_pid" ]; do
sleep 6
let wait--
resync_pid=$(ps -ef | awk -v mddev=$dev 'BEGIN { pattern = "^\\[" mddev "_resync]$" } $8 ~ pattern { print $2 }')
done
[ -n "$resync_pid" -a -n "$renice" ] &&
renice $renice -p $resync_pid >&/dev/null
[ -n "$resync_pid" -a -n "$ionice" ] &&
ionice $ionice -p $resync_pid >&/dev/null
done
[ -z "$check_list" ] && exit 0
waitbusy 0 "$check_list"
for dev in $check_list; do
mismatch_cnt=`cat /sys/block/$dev/md/mismatch_cnt`
# Due to the fact that raid1/10 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/$dev/md/level`
if [ "$raid_lvl" = "raid1" -o "$raid_lvl" = "raid10" ]; then
continue
fi
if [ "$mismatch_cnt" -ne 0 ]; then
echo "WARNING: mismatch_cnt is not 0 on /dev/$dev"
fi
done