Hi,

Sometimes you can get  “CRS-4535 Cannot communicate with Cluster Ready Services  ” error.

 

CRS-4535 Cannot communicate with Cluster Ready Services

When I check the CRS ( Cluster Ready Services ) , Details of error are as follows.

[root@msdbrac01 bin]# crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4530: Communications failure contacting Cluster Synchronization Services daemon
CRS-4534: Cannot communicate with Event Manager

CRS-4535: Cannot communicate with Cluster Ready Services

The cause of this error is generally the permission on the ASM disks on the node where you faced the error.

 

 

CRS-4534: Cannot communicate with Event Manager

Check permisson of ASM Disks as follows.

[root@msdbrac01 bin]# cd /dev/oracleasm/disks
[root@msdbrac01 disks]# ls -lrt
total 0
brw------- 1 root root 8, 17 Jan  9 08:17 ASMDISK1
brw------- 1 root root 8, 33 Jan  9 08:17 ASMDISK2
brw------- 1 root root 8, 49 Jan  9 08:17 ASMDISK3
brw------- 1 root root 8, 65 Jan  9 08:17 ASMDISK4

 

Oracle has no permissions on Disks, so you should grant it as follows.

[root@msdbrac01 disks]# chown -R oracle:dba /dev/oracleasm/disks
[root@msdbrac01 disks]# chmod -R 777 /dev/oracleasm/disks
[root@msdbrac01 disks]# ls -lrt
total 0
brwxrwxrwx 1 oracle dba 8, 17 Jan 9 08:17 ASMDISK1
brwxrwxrwx 1 oracle dba 8, 33 Jan 9 08:17 ASMDISK2
brwxrwxrwx 1 oracle dba 8, 49 Jan 9 08:17 ASMDISK3
brwxrwxrwx 1 oracle dba 8, 65 Jan 9 08:17 ASMDISK4

 

Disk permissions are fixed and check the IPs between all cluster node s(Public, Private and Virtual IP).

Then start Cluster from root user as follows.

[root@msdbrac01 bin]# crsctl start cluster
CRS-2672: Attempting to start 'ora.cssd' on 'msdbrac01'
CRS-2676: Start of 'ora.cssd' on 'msdbrac01' succeeded
CRS-2672: Attempting to start 'ora.ctssd' on 'msdbrac01'
CRS-2676: Start of 'ora.ctssd' on 'msdbrac01' succeeded
CRS-2679: Attempting to clean 'ora.asm' on 'msdbrac01'
CRS-2681: Clean of 'ora.asm' on 'msdbrac01' succeeded
CRS-2672: Attempting to start 'ora.asm' on 'msdbrac01'
CRS-2676: Start of 'ora.asm' on 'msdbrac01' succeeded
CRS-2672: Attempting to start 'ora.crsd' on 'msdbrac01'
CRS-2676: Start of 'ora.crsd' on 'msdbrac01' succeeded

[root@msdbrac01 bin]#

 

Now check CRS again as follows.

[root@msdbrac01 bin]# crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
[root@msdbrac01 bin]#

 

Cluster Ready Services is online now, problem has been fixed.

 

 

 

 

Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )