RAC SCAN的简单配置

    在ORACLE 11R2 版本中引入了SCAN，SCAN的最主要作用就是在rac中增加节点或删除节点对客户端来说是完全透明的：

    1：删除SCAN

       在删除scan之前必须要把scan服务停掉

       

[grid@rac1 ~]$ srvctl stop scan_listener
[grid@rac1 ~]$ srvctl stop scan
[grid@rac1 ~]$ crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora.DATA.dg ora....up.type ONLINE ONLINE rac1
ora....ER.lsnr ora....er.type ONLINE ONLINE rac1
ora....N1.lsnr ora....er.type OFFLINE OFFLINE
ora....N2.lsnr ora....er.type OFFLINE OFFLINE
ora....N3.lsnr ora....er.type OFFLINE OFFLINE
ora.asm ora.asm.type ONLINE ONLINE rac1
ora.eons ora.eons.type ONLINE ONLINE rac1
ora.gsd ora.gsd.type ONLINE ONLINE rac1
ora....network ora....rk.type ONLINE ONLINE rac1
ora.oc4j ora.oc4j.type ONLINE ONLINE rac2
ora.ons ora.ons.type ONLINE ONLINE rac1
ora.orcl.db ora....se.type ONLINE ONLINE rac1
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip ora....t1.type ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip ora....t1.type ONLINE ONLINE rac2
ora....ry.acfs ora....fs.type ONLINE ONLINE rac1
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 ~]$

    删除scan，需要用root的权限 

[root@rac1 ~]# cd /u01/app/grid/11.2.0/bin/
Display all 381 possibilities? (y or n)
[root@rac1 ~]# cd /u01/app/grid/11.2.0/bin/
[root@rac1 bin]# ./srvctl remove scan_listener
Remove scan listener? (y/[n]) y
[root@rac1 bin]# ./srvctl remove scan
Remove the scan? (y/[n]) y
[root@rac1 bin]# ./srvctl status scan
PRCS-1025 : Could not find Single Client Access Name Virtual Internet Protocol(VIP) resources TYPE=ora.scan_vip.type
[root@rac1 bin]# ./srvctl status scan_listener
PRCS-1026 : Could not find Single Client Access Name listener resources TYPE=ora.scan_listener.type

   2：增加scan

      在增加scan之前，得保证SCAN地址都能正确的解析出来

     

[root@rac1 bin]# nslookup rac-scan
Server: 172.72.15.200
Address: 172.72.15.200#53

Name: rac-scan.sb.com
Address: 172.72.15.191
Name: rac-scan.sb.com
Address: 172.72.15.192
Name: rac-scan.sb.com
Address: 172.72.15.190

[root@rac1 bin]#

    增加scan

[root@rac1 bin]# ./srvctl add scan -n rac-scan
[root@rac1 bin]# ./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
[root@rac1 bin]# ./srvctl add scan_listener
[root@rac1 bin]# ./srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is not running
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is not running
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is not running

  3：重启crs服务

     ./crsctl stop cluster -all

     ./crsctl start cluster -all

[root@rac1 bin]# ./srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node rac1
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node rac2
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node rac1

scan的地址分配到各个节点上去了！