CRS-4535: Cannot communicate with Cluster Ready Services

CRS-4535: Cannot communicate with Cluster Ready Services

You may have encountered the following error when you are working with ORACLE RAC, you try to access the CRS service through commands such as:

dbrac1(/u01/grid/product/12.1.0/bin)# ./crsctl stat res -t

CRS-4535: Cannot communicate with Cluster Ready Services

CRS-4000: Command Status failed, or completed with errors.

As a result of the execution of the previous command, we observe that apparently the remaining primary processes of the RAC are functioning correctly.

Then in the following image we can see the usual processes involved in Oracle RAC as well as the different levels of execution in the operating system from the beginning of the same (level 0) to the levels that control system resources.

How to fix this error?

Initially you will notice that when executing the Cluster Ready Services verification command, it shows that both OHASD, CSSD and processes are online, except for the CRSD process with which it is not possible to communicate.

Based on personal experience, these cases usually occur due to file system filling events where the Grid Infrastructure binaries are located, however, there may be other factors that originate it, such as:

• Communication problems between both nodes of the RAC.

• Storage permission issues.

It is always advisable to verify the crsd log located on the path: $ GRID_HOME / log / hostname / crsd to obtain additional useful information that pays for the identification of the root cause as well as the log of alerts for some additional clue.

You can perform the following steps to try to solve the incident and be able to control this process, so it is not necessary to restart the server as a method of stabilizing the service stack.

1) Check with the check crs command, if only the crsd service has problems, if so, you will get an output similar to the following:

dbrac1(/u01/grid/product/12.1.0/bin)# ./crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4535 : Cannot communicate with Cluster Ready Services
CRS-4529 : Cluster Synchronization Services is online
CRS-4533: Event Manager is online

2) Verify if the CRS process is running:

ps -fea |grep crsd.bin

3) Then, if this process is not running, you will try to start the CRS through crsd.

dbrac1(/u01/grid/product/12.1.0/bin)# ./crsctl start res ora.crsd -init
CRS-2672: Attempting to start 'ora.crf' on 'dbrac1'
CRS-2672: Attempting to start 'ora.storage' on 'dbrac1'
CRS-2676: Start of 'ora.crf' on 'dbrac1' succeeded
CRS-2676: Start of 'ora.storage' on 'dbrac1' succeeded
CRS-2672: Attempting to start 'ora.crsd' on 'dbrac1'
CRS-2676: Start of 'ora.crsd' on 'dbrac1' succeeded

4) Verify if the process started correctly and consult other administrator resources by the RAC:

dbrac1(/u01/grid/product/12.1.0/bin)# ./crsctl stat res -t
--------------------------------------------------------------------------------
Name             Target               State               Server          State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE
ora.FRA.dg
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE
ora.LISTENER.lsnr
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE
ora.OCR_VOTE.dg
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE
ora.asm
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE
ora.net1.network
ONLINE            ONLINE            dbrac1            STABLE
ONLINE            ONLINE            dbrac2            STABLE

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Written by: JChevez