DG database recovery

1.Backup  ---
rman target /  

run {
allocate channel c1 type disk;
allocate channel c2 type disk;
allocate channel c3 type disk;
allocate channel c4 type disk;
backup as compressed backupset archivelog from time "to_date('21.04.2014 21:00:00','DD.MM.YYYY HH24:Mi:SS')"   until time "to_date('21.04.2014 22:13:14','DD.MM.YYYY HH24:Mi:SS')" format '/home/lingesan/arch_%U';
}

2.Copy the backup pieces and   new standby controlfile to DG  

3.Restore  ----  
run
{
catalog start with '/home/lingesan';
allocate channel c1 type disk ;
restore archivelog from time "to_date('21.04.2014 21:00:00','DD.MM.YYYY HH24:Mi:SS')"   until time "to_date('21.04.2014 22:13:14','DD.MM.YYYY HH24:Mi:SS')";
}