注：本文谢绝转载！

关于RAC 的SCAN 的理论说明，参考如下链接：

Oracle RAC 集群 SCAN 说明

http://blog.csdn.net/tianlesoftware/article/details/42712979

Oracle 12c RAC 集群使用DNS 实现 SCAN

http://blog.csdn.net/tianlesoftware/article/details/42917867

这篇blog 看下12c中对SCAN 的修改，修改包括2个方面：

（1）  修改SCAN 的名称。

（2）  修改SCAN 的IP 地址。

如果使用的是/etc/hosts里的SCAN，那么只需要修改hosts文件就可以，如果使用DNS的，就需要从DNS 来修改，我这里使用DNS的RAC环境，所以修改DNS为例，进行示范。

另外，修改会停止SCAN，所以如果数据库是用SCAN 连链接的，就需要停部分操作，这部分可以转换到用VIP连链接，修改期间，数据库可以正常运行，其他操作不受影响。

1  当前环境

[grid@rac1 ~]$ crs_stat -t

Name           Type           Target    State    Host       

------------------------------------------------------------

ora....SM.lsnr ora....er.type ONLINE    ONLINE   rac1       

ora....ER.lsnr ora....er.type ONLINE    ONLINE   rac1       

ora....N1.lsnr ora....er.type ONLINE    ONLINE   rac2       

ora....N2.lsnr ora....er.type ONLINE    ONLINE   rac1       

ora....N3.lsnr ora....er.type ONLINE    ONLINE   rac1       

ora.MGMTLSNR   ora....nr.type ONLINE    ONLINE   rac1       

ora.OCR.dg     ora....up.type ONLINE    ONLINE   rac1       

ora.asm       ora.asm.type   ONLINE   ONLINE    rac1       

ora.cvu        ora.cvu.type   ONLINE   ONLINE    rac1       

ora.mgmtdb     ora....db.type ONLINE    ONLINE   rac1       

ora....network ora....rk.type ONLINE    ONLINE   rac1       

ora.oc4j       ora.oc4j.type ONLINE    ONLINE    rac1       

ora.ons        ora.ons.type   ONLINE   ONLINE    rac1       

ora.proxy_advm ora....vm.type ONLINE    ONLINE   rac1       

ora....C1.lsnr application    ONLINE   ONLINE    rac1       

ora.rac1.ons   application    ONLINE   ONLINE    rac1       

ora.rac1.vip   ora....t1.type ONLINE    ONLINE   rac1       

ora....C2.lsnr application    ONLINE   ONLINE    rac2       

ora.rac2.ons   application    ONLINE   ONLINE    rac2       

ora.rac2.vip   ora....t1.type ONLINE    ONLINE   rac2       

ora.scan1.vip  ora....ip.type ONLINE    ONLINE   rac2       

ora.scan2.vip  ora....ip.type ONLINE    ONLINE   rac1       

ora.scan3.vip  ora....ip.type ONLINE    ONLINE   rac1       

[grid@rac1 ~]$ srvctl config scan

SCAN name: scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 0 IPv4 VIP: 192.168.56.21

SCAN name: scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 1 IPv4 VIP: 192.168.56.22

SCAN name: scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 2 IPv4 VIP: 192.168.56.20

[grid@rac1 ~]$

这里是2个节点的RAC 集群。

SCAN 名称是：scan.cndba.cn

3个SCAN IP：

192.168.56.20

192.168.56.21

192.168.56.22

2  修改SCAN

2.1            停止SCAN

[grid@rac1 ~]$ srvctl stop scan_listener

[grid@rac1 ~]$ srvctl stop scan

[grid@rac1 ~]$ srvctl status scan

SCAN VIP scan1 is enabled

SCAN VIP scan1 is not running

SCAN VIP scan2 is enabled

SCAN VIP scan2 is not running

SCAN VIP scan3 is enabled

SCAN VIP scan3 is not running

2.2            修改SCAN 信息

这里我们修改SCAN 名称和IP 地址。

这里将SCAN 名称从SCAN 修改成cndba-scan.

IP 地址修改成：

192.168.56.30

192.168.56.31

192.168.56.32

关于SCAN的修改，参考如下链接：

Oracle 12c RAC 集群使用DNS 实现 SCAN

http://blog.csdn.net/tianlesoftware/article/details/42917867

修改之后，如下：

[grid@rac1 grid]$ nslookupcndba-scan.cndba.cn

Server:       192.168.56.200

Address:   192.168.56.200#53

Name:  cndba-scan.cndba.cn

Address: 192.168.56.30

Name:  cndba-scan.cndba.cn

Address: 192.168.56.31

Name:  cndba-scan.cndba.cn

Address: 192.168.56.32

[grid@rac2 ~]$ nslookup cndba-scan.cndba.cn

Server:       192.168.56.200

Address:   192.168.56.200#53

Name:  cndba-scan.cndba.cn

Address: 192.168.56.31

Name:  cndba-scan.cndba.cn

Address: 192.168.56.32

Name:  cndba-scan.cndba.cn

Address: 192.168.56.30

2.3            执行修改操作

用root用户执行如下操作。

[grid@rac1 ~]$ which srvctl

/u01/gridsoft/12.1.0/bin/srvctl

[grid@rac1 ~]$ which crsctl

/u01/gridsoft/12.1.0/bin/crsctl

[root@rac1 /]# /u01/gridsoft/12.1.0/bin/srvctlmodify scan -n cndba-scan.cndba.cn

[grid@rac1 ~]$ srvctl config scan

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 0 IPv4 VIP: 192.168.56.30

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 1 IPv4 VIP: 192.168.56.31

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 2 IPv4 VIP: 192.168.56.32

[grid@rac1 ~]$

看上去，一切都ok了，实际上，并没有，我们还SCAN_VIP的属性：

[grid@rac1 ~]$ crs_stat -t

Name           Type           Target    State    Host       

------------------------------------------------------------

…

ora.scan1.vip  ora....ip.type OFFLINE   OFFLINE              

ora.scan2.vip  ora....ip.type OFFLINE   OFFLINE              

ora.scan3.vip  ora....ip.type OFFLINE   OFFLINE    

[grid@rac1 ~]$ crsctl stat res ora.scan3.vip-p

NAME=ora.scan3.vip

TYPE=ora.scan_vip.type

ACL=owner:root:rwx,pgrp:root:r-x,other::r--,group:oinstall:r-x,user:grid:r-x

ACTIONS=

…

RESTART_ATTEMPTS=0

SCAN_NAME=scan.cndba.cn

SCRIPT_TIMEOUT=60

SERVER_CATEGORY=ora.hub.category

…

USR_ORA_VIP=192.168.56.20

VERSION=12.1.0.1.0

[grid@rac1 ~]$

[grid@rac1 ~]$ crsctl stat resora.scan3.vip

NAME=ora.scan3.vip

TYPE=ora.scan_vip.type

TARGET=OFFLINE

STATE=OFFLINE

所以我们，我们要修改type里的信息。

用root用户执行：

[root@rac1 /]#/u01/gridsoft/12.1.0/bin/crsctl modify type ora.scan_vip.type -attr"ATTRIBUTE=SCAN_NAME,DEFAULT_VALUE=cndba-scan.cndba.cn"

[root@rac1 /]#

这次就全变了：

[grid@rac1 ~]$ crsctl stat res  ora.scan3.vip -p

NAME=ora.scan3.vip

TYPE=ora.scan_vip.type

…

SCAN_NAME=cndba-scan.cndba.cn

…

USR_ORA_VIP=192.168.56.32

VERSION=12.1.0.1.0

至此，修改完成。

2.4            启动SCAN

用grid用户操作：

[grid@rac1 ~]$ srvctl start scan

[grid@rac1 ~]$ srvctl start scan_listener

2.5            验证

[grid@rac2 ~]$ srvctl config scan

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 0 IPv4 VIP: 192.168.56.30

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 1 IPv4 VIP: 192.168.56.31

SCAN name: cndba-scan.cndba.cn, Network: 1

Subnet IPv4:192.168.56.0/255.255.255.0/eth0

Subnet IPv6:

SCAN 2 IPv4 VIP: 192.168.56.32

[grid@rac2 ~]$

[grid@rac2 ~]$ crsctl stat res -t

--------------------------------------------------------------------------------

Name           Target  State       Server                   Statedetails      

--------------------------------------------------------------------------------

Local Resources

--------------------------------------------------------------------------------

ora.ASMNET1LSNR_ASM.lsnr

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

ora.LISTENER.lsnr

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

ora.OCR.dg

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

ora.net1.network

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

ora.ons

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

ora.proxy_advm

               ONLINE  ONLINE      rac1                     STABLE

               ONLINE  ONLINE      rac2                     STABLE

--------------------------------------------------------------------------------

Cluster Resources

--------------------------------------------------------------------------------

ora.LISTENER_SCAN1.lsnr

      1       ONLINE  ONLINE       rac2                     STABLE

ora.LISTENER_SCAN2.lsnr

      1       ONLINE  ONLINE       rac1                     STABLE

ora.LISTENER_SCAN3.lsnr

      1       ONLINE  ONLINE       rac1                     STABLE

ora.MGMTLSNR

     1        ONLINE  ONLINE      rac1                    169.254.95.238 192.1

                                                            68.57.5,STABLE

ora.asm

     1        ONLINE  ONLINE      rac1                     STABLE

     2        ONLINE  ONLINE      rac2                     STABLE

     3        OFFLINE OFFLINE                               STABLE

ora.cvu

     1        ONLINE  ONLINE      rac1                     STABLE

ora.mgmtdb

     1        ONLINE  ONLINE      rac1                     Open,STABLE

ora.oc4j

     1        ONLINE  ONLINE      rac1                     STABLE

ora.rac1.vip

     1        ONLINE  ONLINE      rac1                     STABLE

ora.rac2.vip

     1        ONLINE  ONLINE      rac2                     STABLE

ora.scan1.vip

      1       ONLINE  ONLINE      rac2                     STABLE

ora.scan2.vip

      1       ONLINE  ONLINE       rac1                     STABLE

ora.scan3.vip

      1       ONLINE  ONLINE       rac1                     STABLE

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------

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注意:加群必须注明表空间和数据文件关系 | 不要重复加群

CNDBA_1: 62697850 (空)    CNDBA_2: 62697716 (满)  CNDBA_3: 283816689

CNDBA_4: 391125754   CNDBA_5:104207940    CNDBA_6: 62697977   CNDBA_7: 142216823（满）