An Oracle blog – Amardeep Sidhu

May 19, 2016

ORA-56841: Master Diskmon cannot connect to a CELL

Filed under: Exadata — Sidhu @ 10:15 pm
Tags: , ,

Faced this error while querying v$asm_disk after adding new storage cell IPs to cellip.ora on DB nodes of an existing cluster on Exadata. Query ends with ORA-03113 end-of-file on communication channel and ORA-56841 is reported in $ORA_CRS_HOME/log/<hostname>/diskmon/diskmon.log. Reason in my case was that the new cell was using different subnet for IB. It was pingable from the db nodes but querying v$asm_disk wasn’t working. Changing the subnet for IB on new cell to the one on existing cells fixed the issue.

 

 

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