1、刪除RAC中其他例項，保證RAC中只有一個例項
$ su - oracle

$ srvctl config database -d jzh
Database unique name: jzh
Database name: jzh
Oracle home: /u01/app/oracle/product/11.2.0/db_1
Oracle user: oracle
Spfile: +DATA/jzh/spfilejzh.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: jzh
Database instances: jzh_1,jzh_2
Disk Groups: DATA,ARCH
Mount point paths:
Services: jzhdb
Type: RAC
Database is administrator managed

$ srvctl stop instance -d jzh -i jzh_2
$ srvctl remove instance -d jzh -i jzh_2
Remove instance from the database jzh? (y/[n]) y
$ srvctl config database -d jzh
Database unique name: jzh
Database name: jzh
Oracle home: /u01/app/oracle/product/11.2.0/db_1
Oracle user: oracle
Spfile: +DATA/jzh/spfilejzh.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: jzh
Database instances: jzh_1
Disk Groups: DATA,ARCH
Mount point paths:
Services: jzhdb
Type: RAC
Database is administrator managed
2、RAC轉換至RAC One Node
$ srvctl convert database -d jzh -c RACONENODE -w 30 -i jzh1
$ srvctl config database -d jzh
Database unique name: jzh
Database name: jzh
Oracle home: /u01/app/oracle/product/11.2.0/db_1
Oracle user: oracle
Spfile: +DATA/jzh/spfilejzh.ora
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: jzh
Database instances:
Disk Groups: DATA,ARCH
Mount point paths:
Services: jzhdb
Type: RACOneNode
Online relocation timeout: 30
Instance name prefix: jzh1
Candidate servers: jzh1
Database is administrator managed
3、重新配置服務
$ srvctl remove service -d jzh -s jzhdb
$ srvctl add service -d jzh -s jzhdb -P BASIC
$ srvctl start service -d jzh -s jzhdb
$ srvctl config service -d jzh -s jzhdb
Service name: jzhdb
Service is enabled
Server pool: jzh
Cardinality: 1
Disconnect: false
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: false
Failover type: NONE
Failover method: NONE
TAF failover retries: 0
TAF failover delay: 0
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: BASIC
Edition:
Preferred instances: jzh1_1
Available instances:

4、RAC One Node failover測試
檢查狀態

$ olsnodes -n
jzh1 1
jzh2 2
$ crsctl stat res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.ARCH.dg
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
ora.DATA.dg
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
ora.LISTENER.lsnr
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
ora.VOTE.dg
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
ora.asm
ONLINE ONLINE jzh1 Started
ONLINE ONLINE jzh2 Started
ora.gsd
OFFLINE OFFLINE jzh1
OFFLINE OFFLINE jzh2
ora.net1.network
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
ora.ons
ONLINE ONLINE jzh1
ONLINE ONLINE jzh2
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE jzh1
ora.cvu
1 OFFLINE OFFLINE
ora.jzh.db
2 ONLINE ONLINE jzh2 Open
ora.jzh.jzhdb.svc
1 ONLINE ONLINE jzh2
ora.jzh1.vip
1 ONLINE ONLINE jzh1
ora.jzh2.vip
1 ONLINE ONLINE jzh2
ora.oc4j
1 ONLINE ONLINE jzh1
ora.scan1.vip
1 ONLINE ONLINE jzh1
此時，DB與SERVICE執行在jzh2上，也就是第二節點，接下來模擬第二節點private網路中斷，第二節點被驅逐(eviction)
# ifconfig eth1 down
查詢crs狀態
$ crsctl stat res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.ARCH.dg
ONLINE ONLINE jzh1
ora.DATA.dg
ONLINE ONLINE jzh1
ora.LISTENER.lsnr
ONLINE ONLINE jzh1
ora.VOTE.dg
ONLINE ONLINE jzh1
ora.asm
ONLINE ONLINE jzh1 Started
ora.gsd
OFFLINE OFFLINE jzh1
ora.net1.network
ONLINE ONLINE jzh1
ora.ons
ONLINE ONLINE jzh1
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE jzh1
ora.cvu
1 OFFLINE OFFLINE
ora.jzh.db
2 ONLINE OFFLINE STARTING
ora.jzh.jzhdb.svc
1 ONLINE OFFLINE
ora.jzh1.vip
1 ONLINE ONLINE jzh1
ora.jzh2.vip
1 ONLINE INTERMEDIATE jzh1 FAILED OVER
ora.oc4j
1 ONLINE ONLINE jzh1
ora.scan1.vip
1 ONLINE ONLINE jzh1

再次查詢
$ crsctl stat res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.ARCH.dg
ONLINE ONLINE jzh1
ora.DATA.dg
ONLINE ONLINE jzh1
ora.LISTENER.lsnr
ONLINE ONLINE jzh1
ora.VOTE.dg
ONLINE ONLINE jzh1
ora.asm
ONLINE ONLINE jzh1 Started
ora.gsd
OFFLINE OFFLINE jzh1
ora.net1.network
ONLINE ONLINE jzh1
ora.ons
ONLINE ONLINE jzh1
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE jzh1
ora.cvu
1 OFFLINE OFFLINE
ora.jzh.db
2 ONLINE ONLINE jzh1 Open ====================》已經切換至節點jzh1上了。
ora.jzh.jzhdb.svc
1 ONLINE ONLINE jzh1
ora.jzh1.vip
1 ONLINE ONLINE jzh1
ora.jzh2.vip
1 ONLINE INTERMEDIATE jzh1 FAILED OVER
ora.oc4j
1 ONLINE ONLINE jzh1
ora.scan1.vip
1 ONLINE ONLINE jzh1
至此，RAC轉換至RAC One Node完成！

RAC轉換至RAC One Node

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