For file system partitions, direct I/O reduces the I/O latency as compared to the synchronous I/O, DSYNC.
Direct I/O is supported only on Sun Solaris
SPARC.
Adjust the stable queue cache properly. A proper cache size ensures that most read transactions are completed within the cache. Configure direct I/O using:
configure replication server set sqm_write_flush to "dio"
This command enables direct /IO and is effective only when the stable queue is on the file system. The direct I/O method allows the Replication Server to read or write directly to the disk without the buffering the file system.
This command is static, which means you must restart the server for it to take effect.
