CRS-4535 Cannot communicate with Cluster Ready Services with CRS-4530: Communications failure contacting Cluster Synchronization Services daemon and CRS-4534

Hi,

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

 

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

 


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

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.

https://ittutorial.org/oracle-database-19c-tutorials-for-beginners/

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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience. I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource. I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks. I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients. If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress mehmetsalih.deveci@outlook.com. -                                                                                                                                                                                                                                                 - Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  mehmetsalih.deveci@outlook.com a mail atabilirsiniz.

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