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Asynchronous IO And ZFS (Doc ID 1391707.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


Provide information on the use of Asynchronous IO for the Oracle database on ZFS file systems.

1. Are there any considerations for setting the following parameters to enable Asnychronous IO for the DB:

2. What are the properties for the different ZFS file systems that should be used for different DB file types (datafiles, temp, undo, redo log, archives)

3. What is the recommended setting for the ZFS SYNC property (possible values standard/always/disabled) if Oracle uses asynchronous IO (filesystemio_options=all and disc_asynch_io=true)
The SYNC option determines the synchronous behavior of a file system's transactions. It determines if and which transaction data should be written to the Oracle Solaris ZFS intent log (ZIL) before being written to the storage.

4. What is the recommended setting for ZFS recordsize.


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