Cyrus IMAP mail server installation and configuration (3)

13. Should I put the online redo log files on the bare device?

This is an excellent choice. Online redo log files are very frequently written files and are very suitable for bare devices. If you use the parallel server option, then the online redo log file must be placed on the bare device.

14. Can you put the archive log file on the bare device?

No way. The archive log file must be placed on the regular UNIX file system or directly onto the tape.

15. Can I put multiple data files on the top of the bare device?

No way. So you have to be very careful when setting up your bare devices. Too small, will lead to space quickly run out, too big words, space is wasted.

16. Should I put a few bare devices on the same physical disk?

It's not good to do that. Because the use of bare devices is to improve disk read and write speed. Placing multiple bare devices on the same physical disk can result in a read-write competition, which is detrimental to increasing I/O speed. You should try to disperse the bare devices to different physical disks, preferably on different disk controllers. This is the best choice.

17. Is it necessary to define all the bare devices to be the same size?

This is not necessary, but dividing it into the same size is good for managing the database.

18. Do I need to change the UNIX core parameters in order to use the bare devices on Unix?

No need. However, you can choose to reduce the size of the buffer, if no other applications are running on the same UNIX machine. The UNIX system buffers are no longer used after the bare devices have been used.

19. In order to improve reading and writing speed, at the operating system level, what can be done?

The use of RAID (inexpensive redundant array of disks) is also a very effective way, especially the system that reads and writes very frequently.

20, after considering all aspects of the above, can there be any way to improve performance?

This requires the optimization of Oracle and the purchase of more disk and disk controllers to distribute I/O to different disks.