Starting Redo Apply -"Warning: OS async I/O limit 128 is lower than recovery batch 1024" on standby (Doc ID 741835.1)

Last updated on APRIL 03, 2017

Applies to:

Oracle Server - Enterprise Edition - Version 10.2.0.1 to 11.1.0.8 [Release 10.2 to 11.1]
Information in this document applies to any platform.
Oracle Server Enterprise Edition - Version: 10.2.0.1 to 11.1.0.8
***Checked for relevance on 26-Sep-2012***


Symptoms

A warning message in Alert log asynchronous I/O limit warning of the form:

"Warning: OS async I/O limit 128 is lower than recovery batch 1024"


may be signaled in the alert log by recovery slave or coordinator processes.This error is because of kernel has not been configured sufficiently for async IO operations.

Operations will still continue but IO operations will not be performed asynchronously which may impact recovery performance and will generate more trace files.

 

NOTE : HP-UX enables Oracle Database to perform I/O to (only) raw disk partitions using an asynchronous method

Cause

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