public function GetFreeDeviceNameSNMP()
{
$DBFarm = $this->GetFarmObject();
$snmpClient = new Scalr_Net_Snmp_Client();
$port = $this->GetProperty(\SERVER_PROPERTIES::SZR_SNMP_PORT);
$snmpClient->Connect($this->remoteIp, $port ? $port : 161, $DBFarm->Hash, false, false, true);
$result = implode(":", $snmpClient->getTree("UCD-DISKIO-MIB::diskIODevice"));
$map = array("f", "g", "h", "i", "j", "k", "l", "m", "n", "p");
$n_map = array("1", "2", "3", "4", "5", "6", "7", "8", "9");
$map_used = array();
preg_match_all("/(sd|xvd)([a-z][0-9]*)/", $result, $matches);
foreach ($matches[2] as $v) {
if (!in_array($map_used, $v)) {
array_push($map_used, $v);
}
}
if (count($map_used) == 0) {
throw new Exception(_("Cannot get a list of used disk devices: {$result}"));
}
$device_l = false;
foreach ($n_map as $v) {
foreach ($map as $letter) {
if (in_array($letter, $map_used)) {
continue;
}
$device_l = "{$letter}{$v}";
if (!in_array($device_l, $map_used)) {
break;
} else {
$device_l = false;
}
}
if ($device_l) {
break;
}
}
if (!$device_l) {
throw new Exception(_("There is no available device letter on instance for attaching EBS"));
}
return "/dev/sd{$device_l}";
}
