在Oracle11.2 RAC 的ASM 实例上创建10g 数据库时，报错说：不能连接到Cluster Manager ，不能定位到ASM 实例。具体错误信息如下：
ORA-15077: could not locate ASM instance serving a required diskgroup
ORA-29701: unable to connect to Cluster Manager
我的目标是将10g 数据库迁移升级到11.2RAC 的环境中。首先是在11.2RAC 上恢复好10g 的数据库，再到11g 的RDBMS 环境中去升级。
在恢复控制文件时，就报错。显示不能连接到Cluster Manager 。
/u02/rman_211@serv2=>servdb2$rman target /
Recovery Manager: Release 10.2.0.4.0 - Production on Fri May 4 10:52:22 2012
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: servdb (not mounted)
RMAN> restore controlfile from '/u02/rman_211/ctl_1un9u0a4_1_1.20120501';
Starting restore at 04-MAY-12
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=320 devtype=DISK
channel ORA_DISK_1: restoring control file
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 05/04/2012 10:52:49
ORA-19870: error reading backup piece /u02/rman_211/ctl_1un9u0a4_1_1.20120501
ORA-19504: failed to create file "+WEBDG/servdb/control01.ctl"
ORA-17502: ksfdcre:3 Failed to create file +WEBDG/servdb/control01.ctl
ORA-15001: diskgroup "WEBDG" does not exist or is not mounted
ORA-15077: could not locate ASM instance serving a required diskgroup
ORA-29701: unable to connect to Cluster Manager
Oracle 官方文档对此错误的解释时11gR2 不兼容老版本的数据库。11gR2 的集群配置是动态的，而老版本的库如10.2 版本的库要求集群配置是固定的。
Oracle 官方文档同时也给出了解决方法，即是将css 资源pin 住。
使用root 用户登录操作系统，执行下列命令。
[root@serv2 bin]# ./crsctl pin css -n serv1 serv2
CRS-4664: Node serv1 successfully pinned.
CRS-4664: Node serv2 successfully pinned.
[root@serv2 bin]#
[root@serv2 bin]# ./olsnodes -t
serv1 Pinned
serv2 Pinned
再回到RMAN 界面去恢复控制文件，正常了。
RMAN> restore controlfile from '/u02/rman_211/ctl_1un9u0a4_1_1.20120501';
Starting restore at 04-MAY-12
using channel ORA_DISK_1
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed
output filename=+WEBDG/servdb/control01.ctl
output filename=+WEBDG/servdb/control02.ctl
Finished restore at 04-MAY-12
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