test_disks

function listDir($root) {
  $iter = new RecursiveIteratorIterator(
          new RecursiveDirectoryIterator($root, 
          RecursiveDirectoryIterator::SKIP_DOTS),
          RecursiveIteratorIterator::SELF_FIRST,
          RecursiveIteratorIterator::CATCH_GET_CHILD);
  $paths = array();
  foreach ($iter as $path => $fileinfo) {
    if (! $fileinfo->isDir()) $paths[] = $path;
  }
  return $paths;
}

function get_unasigned_disks() {
  $paths          = listDir("/dev/disk/by-id");
  $disks_id       = preg_grep("#wwn-|-part#", $paths, PREG_GREP_INVERT);
  $disks_real     = array_map(function($p){return realpath($p);}, $disks_id);
  exec("/usr/bin/strings /boot/config/super.dat 2>/dev/null|grep -Po '.{10,}'", $disks_serial);
  $disks_cfg      = is_file("/boot/config/disk.cfg") ? parse_ini_file("/boot/config/disk.cfg") : array();
  $cache_serial   = array_flip(preg_grep("#cacheId#i", array_flip($disks_cfg)));
  $flash          = realpath("/dev/disk/by-label/UNRAID");
  $flash_serial   = array_filter($paths, function($p) use ($flash) {if(!is_bool(strpos($flash,realpath($p)))) return basename($p);});
  $unraid_serials = array_merge($disks_serial,$cache_serial,$flash_serial);
  $unraid_disks   = array();
  foreach($unraid_serials as $serial) {
    $unraid_disks = array_merge($unraid_disks, preg_grep("#".preg_quote($serial, "#")."#", $disks_id));
  }
  $unraid_real = array_map(function($p){return realpath($p);}, $unraid_disks);
  $unassigned  = array_flip(array_diff(array_combine($disks_id, $disks_real), $unraid_real));
  natsort($unassigned);
  foreach ($unassigned as $k => $disk) {
    unset($unassigned[$k]);
    $parts = array_values(preg_grep("#{$disk}-part\d+#", $paths));
    $device = realpath($disk);
    if (! is_bool(strpos($device, "/dev/sd")) || ! is_bool(strpos($device, "/dev/hd"))) {
      $unassigned[$disk] = array("device"=>$device,"partitions"=>$parts);
    }
  }
  echo "\nDisks:\n+ ".implode("\n+ ", array_map(function($k,$v){return "$k => $v";}, $disks_real, $disks_id));
  echo "\nunRAID Serials:\n+ ".implode("\n+ ", $unraid_serials);
  echo "\nunRAID Disks:\n+ ".implode("\n+ ", $unraid_disks);
  echo "\nUnassigned Disks:\n+ ".print_r($unassigned,true);
  return $unassigned;
}

get_unasigned_disks();