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How to change IP and subnet mask of Exadata database nodes and Storage cells

December 25, 2014 Leave a comment Go to comments
1. Check backup of  OCR
ocrconfig -showbackup
crsctl query css votedisk
Location to check  – /cdata/cluster_name
2.Take a backup of the gpnp profile on all nodes before starting.
cd /gpnp/dbnode1/profiles/peer
cp -p profile.xml profile.xml.bk
3.Determine if the CLUSTER_INTERCONNECT parameter is used in the Oracle Database and Oracle  ASM instances using the following command
set linesize 300
col NAME form a50
col VALUE form a50
SELECT inst_id, name,value FROM gv$parameter WHERE name =’cluster_interconnects’;
   INST_ID NAME                                               VALUE
———- ————————————————– ————————————————–
         1 cluster_interconnects                              192.168.10.31
         2 cluster_interconnects                              192.168.10.32
ASM
ALTER SYSTEM SET CLUSTER_INTERCONNECTS=’192.168.20.31′ SCOPE=SPFILE SID=’+ASM1′;
ALTER SYSTEM SET CLUSTER_INTERCONNECTS=’192.168.20.32′ SCOPE=SPFILE SID=’+ASM2′;
DATABASE
ALTER SYSTEM SET CLUSTER_INTERCONNECTS=’192.168.20.31′ SCOPE=SPFILE SID=’DATABASE1′;
ALTER SYSTEM SET CLUSTER_INTERCONNECTS=’192.168.20.32′ SCOPE=SPFILE SID=’DATABASE2′;
4.Shut down all cluster-managed services on each database server as the oracle user using the  following command:
srvctl stop home -o -s /tmp/dbnode1_dbhome -n dbnode1
srvctl stop home -o -s /tmp/dbnode2_dbhome -n dbnode2
5. Modify the cluster interconnect interface to use the BONDIB0 interface on the first database server as follows – NEEDS TO BE DONE ON  FIRST NODE ONLY
a. Log in as the oracle user.
b. Set ORACLE_HOME to the Grid Infrastructure home.
c. Set the base for the ORACLE_SID environment variable using the following command. The
ORACLE_HOME environment variable must be set to the Grid Infrastructure home.
5.1  oifcfg iflist
eth0  10.240.64.0
bondeth0  10.240.48.0
bondib0  192.168.8.0
bondib0  169.254.0.0
5.2  oifcfg getif
bondeth0  10.240.48.0  global  public
bondib0  192.168.8.0  global  cluster_interconnect
Assign BONDIB0 as the global cluster interconnect interface using the following command:
5.3 oifcfg setif -global bond0/192.168.20.0:cluster_interconnect
5.4 Check Ips again
oifcfg getif
Output
bondeth0 10.240.48.0 global public
Bondib0 192.168.8.0 global cluster_interconnect
Bondib0 192.168.20.0 global cluster_interconnect
6.Shut down Oracle Clusterware and Oracle Clusterware CRS on each database server as follows
a./bin/crsctl stop crs -f
b./bin/crsctl disable crs
7.Change the InfiniBand IP addresses on each Exadata Storage Server as follows:
7.1 login as root
7.2 service celld stop
7.3 service ocrvottargetd stop
7.4 ipconf
[root@cellnode1 ~]# service celld stop
Stopping the RS, CELLSRV, and MS services…
The SHUTDOWN of services was successful.
[root@cellnode1 ~]# service ocrvottargetd stop
[root@cellnode1 ~]# service ocrvottargetd status
[root@cellnode1 ~]# ipconf
Logging started to /var/log/cellos/ipconf.log
Interface ib0 is Linked.  hca: mlx4_0
Interface ib1 is Linked.  hca: mlx4_0
Interface eth0 is Linked.  driver/mac: igb/00:21:28:d7:cf:82
Interface eth1 is … Unlinked.  driver/mac: igb/00:21:28:d7:cf:83
Interface eth2 is … Unlinked.  driver/mac: igb/00:21:28:d7:cf:84
Interface eth3 is … Unlinked.  driver/mac: igb/00:21:28:d7:cf:85
Network interfaces
Name     State      IP address      Netmask         Gateway         Net type     Hostname
ib0      Linked
ib1      Linked
eth0     Linked
eth1     Unlinked
eth2     Unlinked
eth3     Unlinked
Warning. Some network interface(s) are disconnected. Check cables and swicthes and retry
Do you want to retry (y/n) [y]: n
The current nameserver(s): 10.239.32.5 10.38.9.31 10.239.96.36 10.8.130.191
Do you want to change it (y/n) [n]:
The current timezone: Asia/Kolkata
Do you want to change it (y/n) [n]:
The current NTP server(s): 10.46.192.98
Do you want to change it (y/n) [n]:
Network interfaces
Name     State      IP address      Netmask         Gateway         Net type     Hostname
eth0     Linked     10.240.64.237   255.255.255.0   10.240.64.1     Management   cellnode1.enterprisenet.org
eth1     Unlinked
eth2     Unlinked
eth3     Unlinked
bondib0  ib0,ib1    192.168.10.33   255.255.252.0                   Private      cellnode1-priv.enterprisenet.org
Select interface name to configure or press Enter to continue: bondib0
Selected interface. bondib0
IP address or none [192.168.10.33]: 192.168.20.33
Netmask [255.255.252.0]:
Fully qualified hostname or none [cellnode1-priv.enterprisenet.org]:
Continue configuring or re-configuring interfaces? (y/n) [y]: n
Select canonical hostname from the list below
1: cellnode1.enterprisenet.org
2: cellnode1-priv.enterprisenet.org
Canonical fully qualified domain name [1]:
Select default gateway interface from the list below
1: eth0
Default gateway interface [1]:
Canonical hostname: cellnode1.enterprisenet.org
Nameservers: 10.239.32.5 10.38.9.31 10.239.96.36 10.8.130.191
Timezone: Asia/Kolkata
NTP servers: 10.46.192.98
Default gateway device: eth0
Network interfaces
Name     State      IP address      Netmask         Gateway         Net type     Hostname
eth0     Linked     10.240.64.237   255.255.255.0   10.240.64.1     Management   cellnode1.enterprisenet.org
eth1     Unlinked
eth2     Unlinked
eth3     Unlinked
bondib0  ib0,ib1    192.168.20.33   255.255.252.0                   Private      cellnode1-priv.enterprisenet.org
Is this correct (y/n) [y]:
Do you want to configure basic ILOM settings (y/n) [y]: n
Info. IP address of bondib0 changed to “192.168.20.33”
Info. Run /opt/oracle.cellos/validations/init.d/saveconfig
Info. Custom changes have been detected in /etc/sysconfig/network-scripts/ifcfg-bondib0
Warning. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Existing line “IPADDR=192.168.10.33” will be overwritten with “IPADDR=192.168.20.33”
Info. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Original line “IPADDR=192.168.10.33” will be commented
Warning. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Existing line “NETWORK=192.168.8.0” will be overwritten with “NETWORK=192.168.20.0”
Info. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Original line “NETWORK=192.168.8.0” will be commented
Warning. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Existing line “BROADCAST=192.168.11.255” will be overwritten with “BROADCAST=192.168.23.255”
Info. Config /etc/sysconfig/network-scripts/ifcfg-bondib0. Original line “BROADCAST=192.168.11.255” will be commented
Info. Original file will be saved in /opt/oracle.cellos/conf/network-scripts/backup_by_Exadata_ipconf
Info. Original file will be saved in /etc/ssh/sshd_config.backupbyExadata
Info. Generate /etc/ssh/sshd_config with ListenAddress(es) 10.240.64.237, 192.168.20.33
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]
bash /opt/oracle.cellos/ib_set_node_desc.sh
Re-login using new IP address 10.240.64.237 if you were disconnected after following commands
echo -n
ifdown bondib0
sleep 1
/opt/oracle.cellos/reset_rule_table.sh 200
sleep 1
ifup bondib0
sleep 3
cellcli -e “alter cell startup services rs”
cellcli -e “alter cell startup services ms”
cellcli -e “alter cell interconnect1=bondib0”
cellcli -e “alter cell shutdown services all force”
service ocrvottargetd restart
sleep 1
tgtadm: can’t find the target
Starting the RS services…
Getting the state of RS services…  running
Starting MS services…
The STARTUP of MS services was successful.
A restart of all services is required to put new network configuration into effect. MS-CELLSRV communication may be hampered until restart.
Cell cellnode1 successfully altered
Stopping the RS, CELLSRV, and MS services…
The SHUTDOWN of services was successful.
ipaddress1=192.168.20.33/22
[root@cellnode1 ~]#
7.5  as root user   – reboot
7.6 Verify the newly-assigned InfiniBand address on Exadata Storage Server using the following command
cellcli -e list cell detail | grep ipaddress1
Current output :
[root@cellnode1 ~]# cellcli -e list cell detail | grep ipaddress1
         ipaddress1:             192.168.10.33/22
Output after change
[root@cellnode1 ~]# cellcli -e list cell detail | grep ipaddress1
         ipaddress1:             192.168.20.33/22
7.7. If there is an error indicating that one or more cell services are not running, then restart the cell  services using the following command:
cellcli -e alter cell restart services all
8.Change the InfiniBand IP addresses on each database server as follows  – NEEDS TO BE PERFORMED ON ALL NODES ONE BY ONE
8.1 login as root
8.2 cd /etc/sysconfig/network-scripts
8.3 cp ifcfg-bondib0 orig_ifcfg-bondib0  
8.4 Edit the ifcfg-bond0 file to update the IPADDR, NETMASK, NETWORK and BROADCAST
fields.
[root@dbnode1 network-scripts]# cat ifcfg-bondib0
#### DO NOT REMOVE THESE LINES ####
#### %GENERATED BY CELL% ####
DEVICE=bondib0
USERCTL=no
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.10.31
NETMASK=255.255.252.0
NETWORK=192.168.8.0
BROADCAST=192.168.11.255
BONDING_OPTS=”mode=active-backup miimon=100 downdelay=5000 updelay=5000 num_grat_arp=100″
IPV6INIT=no
MTU=65520
[root@dbnode2 network-scripts]# cat ifcfg-bondib0
#### DO NOT REMOVE THESE LINES ####
#### %GENERATED BY CELL% ####
DEVICE=bondib0
USERCTL=no
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.10.32
NETMASK=255.255.252.0
NETWORK=192.168.8.0
BROADCAST=192.168.11.255
BONDING_OPTS=”mode=active-backup miimon=100 downdelay=5000 updelay=5000 num_grat_arp=100″
IPV6INIT=no
MTU=65520
UPDATED VALUE for DBNODE1 and DBNODE2
FOR DBNODE1?
IPADDR=192.168.20.31
NETMASK=255.255.252.0
NETWORK=192.168.20.0
BROADCAST=192.168.23.255
FOR DBNODE2?
IPADDR=192.168.20.32
NETMASK=255.255.252.0
NETWORK=192.168.20.0
BROADCAST=192.168.23.255
8.5 reboot
8.6 Verify the InfiniBand IP address information using the following command
Current value – dbnode1
bondib0   Link encap:InfiniBand  HWaddr 80:00:00:48:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
          inet addr:192.168.10.32  Bcast:192.168.11.255  Mask:255.255.252.0
          inet6 addr: fe80::221:2800:1cf:2b97/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:65520  Metric:1
          RX packets:62232895 errors:0 dropped:0 overruns:0 frame:0
          TX packets:67053494 errors:3 dropped:14 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:41159776048 (38.3 GiB)  TX bytes:34502152558 (32.1 GiB)
Current value – dbnode2
bondib0   Link encap:InfiniBand  HWaddr 80:00:00:48:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
          inet addr:192.168.10.31  Bcast:192.168.11.255  Mask:255.255.252.0
          inet6 addr: fe80::221:2800:1cf:1e67/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:65520  Metric:1
          RX packets:67191396 errors:0 dropped:0 overruns:0 frame:0
          TX packets:63617557 errors:0 dropped:11 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:34394734207 (32.0 GiB)  TX bytes:41626158309 (38.7 GiB)
ifconfig -a
bondib0   Link encap:InfiniBand  HWaddr 80:00:00:48:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
          inet addr:192.168.20.32  Bcast:192.168.23.255  Mask:255.255.252.0
          inet6 addr: fe80::221:2800:1cf:2b97/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:65520  Metric:1
          RX packets:62232895 errors:0 dropped:0 overruns:0 frame:0
          TX packets:67053494 errors:3 dropped:14 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:41159776048 (38.3 GiB)  TX bytes:34502152558 (32.1 GiB)
Current value – dbnode2
bondib0   Link encap:InfiniBand  HWaddr 80:00:00:48:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
          inet addr:192.168.20.31  Bcast:192.168.23.255  Mask:255.255.252.0
          inet6 addr: fe80::221:2800:1cf:1e67/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:65520  Metric:1
          RX packets:67191396 errors:0 dropped:0 overruns:0 frame:0
          TX packets:63617557 errors:0 dropped:11 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:34394734207 (32.0 GiB)  TX bytes:41626158309 (38.7 GiB)
9.Modify Cellinit.ora  (Do not edit the cellinit.ora or cellip.ora files when the database or Oracle ASM instance are running)
9.1 cd /etc/oracle/cell/network-config/
Current value on dbnode1
[root@dbnode1 network-config]# cat cellinit.ora
ipaddress1=192.168.10.31/22
[root@dbnode2 network-config]# cat cellinit.ora
ipaddress1=192.168.10.32/22
9.1 cp cellinit.ora cellinit.new
9.2 Modify cellinit.new to
ipaddress1=192.168.20.31/22
ipaddress1=192.168.20.32/22
9.3 rename the file back
mv cellinit.new cellinit.ora
10.Modify cellip.ora
10.1 cd /etc/oracle/cell/network-config/
Current Values :
[root@dbnode1 network-config]# cat cellip.ora
cell=”192.168.10.33″
cell=”192.168.10.34″
cell=”192.168.10.35″
[root@dbnode2 network-config]# cat cellip.ora
cell=”192.168.10.33″
cell=”192.168.10.34″
cell=”192.168.10.35″
10.2 cp cellip.ora orig_cellip.ora
10.3 modify cellip.ora to following on both nodes
cell=”192.168.20.33″
cell=”192.168.20.34″
cell=”192.168.20.35″
11.Update the /etc/hosts file on each database server and Exadata Storage Servers
11.1 login as root
11.2 Current value on both dbnode1 and dbnode2
### Compute Node Private Interface details
#####192.168.10.1       dbnode1-priv.enterprisenet.org dbnode1-priv
#####192.168.10.2       dbnode2-priv.enterprisenet.org dbnode2-priv
192.168.10.31   dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.10.32   dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
#####192.168.10.3       cellnode1-priv.enterprisenet.org cellnode1-priv
#####192.168.10.4       cellnode2-priv.enterprisenet.org cellnode2-priv
#####192.168.10.5       cellnode3-priv.enterprisenet.org cellnode3-priv
192.168.10.33   cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.10.34   cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.10.35   cellnode3-priv.enterprisenet.org cellnode3-priv
On CELLNODE1
#### END Generated by Exadata ####
### Compute Node Private Interface details
192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
# 192.168.10.3  cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.10.4    cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.10.5    cellnode3-priv.enterprisenet.org cellnode3-priv
On CELLNODE2
#### END Generated by Exadata ####
### Compute Node Private Interface details
192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
192.168.10.3    cellnode1-priv.enterprisenet.org cellnode1-priv
# 192.168.10.4  cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.10.5    cellnode3-priv.enterprisenet.org cellnode3-priv
Updated value
On CELLNODE3
#### END Generated by Exadata ####
### Compute Node Private Interface details
192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
192.168.10.3    cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.10.4    cellnode2-priv.enterprisenet.org cellnode2-priv
# 192.168.10.5  cellnode3-priv.enterprisenet.org cellnode3-priv
11.3 cp /etc/hosts /etc/orig_hosts
11.4 update to
On both dbnode1 and dbnode2
#####192.168.10.1       dbnode1-priv.enterprisenet.org dbnode1-priv
#####192.168.10.2       dbnode2-priv.enterprisenet.org dbnode2-priv
#####192.168.10.31   dbnode1-priv.enterprisenet.org dbnode1-priv
#####192.168.10.32   dbnode2-priv.enterprisenet.org dbnode2-priv
192.168.20.31   dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.20.32   dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
#####192.168.10.3       cellnode1-priv.enterprisenet.org cellnode1-priv
#####192.168.10.4       cellnode2-priv.enterprisenet.org cellnode2-priv
#####192.168.10.5       cellnode3-priv.enterprisenet.org cellnode3-priv
#####192.168.10.33   cellnode1-priv.enterprisenet.org cellnode1-priv
#####192.168.10.34   cellnode2-priv.enterprisenet.org cellnode2-priv
#####192.168.10.35   cellnode3-priv.enterprisenet.org cellnode3-priv
192.168.20.33   cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.20.34   cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.20.35   cellnode3-priv.enterprisenet.org cellnode3-priv
On CELLNODE1
#### END Generated by Exadata ####
### Compute Node Private Interface details
###192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
###192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
192.168.20.31    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.20.32    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
### 192.168.10.3  cellnode1-priv.enterprisenet.org cellnode1-priv
##192.168.10.4    cellnode2-priv.enterprisenet.org cellnode2-priv
##192.168.10.5    cellnode3-priv.enterprisenet.org cellnode3-priv
# 192.168.20.33  cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.20.34    cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.20.35    cellnode3-priv.enterprisenet.org cellnode3-priv
On CELLNODE2
#### END Generated by Exadata ####
### Compute Node Private Interface details
###192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
###192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
192.168.20.31    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.20.32    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
##192.168.10.3    cellnode1-priv.enterprisenet.org cellnode1-priv
### 192.168.10.4  cellnode2-priv.enterprisenet.org cellnode2-priv
##192.168.10.5    cellnode3-priv.enterprisenet.org cellnode3-priv
192.168.20.33    cellnode1-priv.enterprisenet.org cellnode1-priv
# 192.168.20.34  cellnode2-priv.enterprisenet.org cellnode2-priv
192.168.20.35    cellnode3-priv.enterprisenet.org cellnode3-priv
On CELLNODE3
#### END Generated by Exadata ####
### Compute Node Private Interface details
###192.168.10.1    dbnode1-priv.enterprisenet.org dbnode1-priv
###192.168.10.2    dbnode2-priv.enterprisenet.org dbnode2-priv
192.168.20.31    dbnode1-priv.enterprisenet.org dbnode1-priv
192.168.20.32    dbnode2-priv.enterprisenet.org dbnode2-priv
### CELL Node Private Interface details
##192.168.10.3    cellnode1-priv.enterprisenet.org cellnode1-priv
## 192.168.10.4  cellnode2-priv.enterprisenet.org cellnode2-priv
###192.168.10.5    cellnode3-priv.enterprisenet.org cellnode3-priv
192.168.20.33      cellnode1-priv.enterprisenet.org cellnode1-priv
192.168.20.34       cellnode2-priv.enterprisenet.org cellnode2-priv
#192.168.20.35    cellnode3-priv.enterprisenet.org cellnode3-priv
12. Start Oracle Clusterware on each server using the following  command
/bin/crsctl start crs
13. Verify the cluster interconnect is using the RDS protocol on each database server by  examining the Oracle ASM alert.log
cd /u01/app/oracle/diag/asm/+asm/+ASM1/trace  for dbnode2
cd /u01/app/oracle/diag/asm/+asm/+ASM2/trace  for dbnode2
view alert_+ASM1.log
view alert_+ASM2.log
Search for “CELL interconnect IPC version: Oracle RDS/IP (generic)”
13.1 Check using skgxpinfo 
Current ouput
oracle >skgxpinfo
rds
13.2 If the instance is not using the RDS protocol over InfiniBand, then relink the Oracle binary as follows(if it is using RDS already, it does not change while chaging IP):
13.2.1 :As the oracle user, shut down any processes using the Oracle binary
crscrtl stop crs -f
13.2.2 As the root user
/crs/install/rootcrs.pl -unlock
13.2.3 as oracle user
cd /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib
make -f ins_rdbms.mk ipc_rds ioracle
13.2.4 run the following command if relinking the grid infrastructure home. Do not perform this step if you are not relinking the grid infrastructure home.
GRID_HOME/crs/install/rootcrs.pl -patch
14.Start all cluster-managed services using the SRVCTL utility as follows
14.1 Login as oracle
14.2 srvctl start home -o /u01/app/oracle/product/11.2.0/dbhome_1 -s /tmp/dbnode1_dbhome -n dbnode1
14.3 srvctl status database -d DATABASE
15. Verifiy using on both ASM and DB instance
set linesize 300
col NAME form a50
col VALUE form a50
SELECT inst_id, name,value FROM gv$parameter WHERE name =’cluster_interconnects’;
16. Delete the Old Private Network
oifcfg delif -global bondib0/192.168.8.0
16.1 Verify Old Interface is no longer present
oifcfg getif
==> oifcfg getif
bondeth0  10.240.48.0  global  public
bondib0  192.168.30.0  global  cluster_interconnect
17.1 Enable Oracle Clusterware CRS automatic restart on each database server as follows
u01/app/11.2.0/grid/bin/crsctl enable crs on both nodes
18. Restart the cluster one by one and verify
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