Hello Experts,
I have been reading the parts of the System Administration Guide which are related to device I/O setting.
What I have obtained are the following facts,
- Dsync ensures that writes to the device file occur directly to the disk in addition to the file system buffer.
- Directio ensures that direct writes to disk occur and file system buffer is bypassed.
- Master always has Dsync on.
It looks like they both write to disk directly and have the same level of recoverability. Then why should master always have the Dsync on ?
Does anyone provide more input?
Regards,
Chi Wo