#!/bin/bash
# kreknin array monitor — md0/md1 (system boot mirror) + md3 (data). Run with sudo via Monitor.
# Completion signal: sync_action idle AND mdadm Active Devices == Total Devices (works for 16-slot template too).
arrays="md0 md1 md3"
declare -A prev_state
declare -A prev_pct
declare -A crc0
while true; do
  for a in $arrays; do
    [ -e "/sys/block/$a/md/sync_action" ] || continue
    act=$(cat "/sys/block/$a/md/sync_action" 2>/dev/null)
    active=$(mdadm --detail "/dev/$a" 2>/dev/null | awk '/Active Devices/{print $3; exit}')
    total=$(mdadm --detail "/dev/$a" 2>/dev/null | awk '/Total Devices/{print $3; exit}')
    brk=$(sed -n "/^$a :/,/^$/p" /proc/mdstat | grep blocks | grep -o '\[[^]]*\]' | tail -1)
    sig="$act|$brk|a=$active/t=$total"
    if [ "${prev_state[$a]}" != "$sig" ]; then
      echo "[$a-state] $sig"
      prev_state[$a]="$sig"
    fi
    if [ "$act" = "idle" ] && [ "$active" = "$total" ] && [ "${prev_state[$a]}" != "DONE" ]; then
      echo "[$a] COMPLETE healthy active=$active/$total $brk"
      prev_state[$a]="DONE"
    fi
  done
  pct=$(cat /sys/block/md3/md/sync_completed 2>/dev/null | awk -F/ '$2>0{printf "%d", $1*100/$2}')
  m=$(( (pct+4)/5*5 ))
  if [ "$m" -gt "${prev_pct[md3]:-0}" ]; then echo "[md3] $pct%"; prev_pct[md3]="$m"; fi
  for d in sda sdb sdc; do
    crc=$(smartctl -d sat -A /dev/$d 2>/dev/null | awk '/UDMA_CRC/{print $10; exit}')
    [ -n "$crc" ] && { [ -n "${crc0[$d]}" ] && [ "$crc" -gt "${crc0[$d]}" ] && echo "[CRC-GROW] $d ${crc0[$d]}->$crc"; crc0[$d]=$crc; }
  done
  sleep 120
done