In release 12.0, Sybase introduced the dsync option of the disk init command. This option guarantees that writes to database devices placed on Unix file systems are performed by the operating system as soon as the server flushes the data. In the past, the server might log a write, but the operating system buffered the data. If the system went down, the server had no way to recover the buffered data that was lost.
The dsync option could cause a performance problem in some cases. If you place tempdb on a file system, you should consider disabling dsync on that device. For more information about using the dsync option to protect data on Unix file systems, see the System Administration Guide.
