ASM Communication Error ORA-15055 ORA-21561

(Doc ID 1565297.1)

Last updated on JANUARY 30, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 to 11.2.0.3 [Release 11.2]
Generic Windows
***Checked for relevance on 24-Mar-2015***

Symptoms


In Oracle RAC 11.2.0.3 on Windows 2008 R2 the application may run extreamly slow and some times just hanging and there may be  many errors like below on one of the RAC Database Nodes:

WARNING: ASM communication error: op 0 state 0x0 (15055)
ERROR: direct connection failure with ASM

ORA-15055: unable to connect to ASM instance
ORA-21561: OID generation failed
ORA-15055: unable to connect to ASM instance
ORA-21561: OID generation failed
ORA-00312: online log 1 thread 1: '+DBDATA/db/onlinelog/group_1.261.770482257'
ORA-17503: ksfdopn:2 Failed to open file +DBDATA/db/onlinelog/group_1.261.770482257
ORA-15055: unable to connect to ASM instance
ORA-21561: OID generation failed

 

Cause

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