一、问题描述：恢复控制文件时，出现如下错误。

run {

allocate channel ch1 device type 'sbt_tape' 

PARMS="ENV=(MASTER_SERVER_IP=100.100.1.148,INSTANCE_NAME=sxsbcdb3,BACKUP_CLIENT=Client_1_727,RESTORE_CLIENT=Client_1_668)";

restore controlfile from 'avatar_controlfile_194847_1_1081628404';

release channel ch1;

6> }

allocated channel: ch1

channel ch1: SID=6433 instance=sxsbcdb2 device type=SBT_TAPE

channel ch1: ABE RMAN Backup(V5.0.5001.19043001)

Starting restore at 28-AUG-21

channel ch1: restoring control file

released channel: ch1

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of restore command at 08/28/2021 17:05:23

ORA-19870: error while restoring backup piece avatar_controlfile_194847_1_1081628404

ORA-19504: failed to create file "+DATA/SXSBCDB/controlfile"

ORA-17502: ksfdcre:4 Failed to create file +DATA/SXSBCDB/controlfile

ORA-15005: name "+DATA/SXSBCDB/controlfile" is already used by an existing alias

二、解决方式：

检查磁盘组是否存在同名目录

修改参数文件 *.control_files='+DATA','+FRA'，重启指定pfile启动到nomount后恢复成功。