Asynchronous IO And ZFS (Doc ID 1391707.1)

Last updated on JULY 21, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 and later
Information in this document applies to any platform.
***Checked for relevance on 21-Jul-2017***

Goal

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:
   FILESYSTEMIO_OPTIONS=SETALL
   DISK_ASYNCH_IO=TRUE

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.

Solution

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