Using the appropriate hardware, operating system, or database features can improve the downtime security of a database instance.
In a production system, the log area should always be mirrored for security. You should use hardware-based solutions to do this. If this is not possible, you can set the log mode of the SAP DB database system to use software-based methods for the mirroring.
Operate the log volumes in a RAID-1 configuration, since the database instance writes the log entries sequentially.
In a production system, always stick to standard log backups, and never deactivate redo log management, even if you use RAID systems for the data volumes.
See Log settings
If you want to ensure a high standard of availability, we recommend using RAID-5 or RAID-1 configurations for the data area. A disk crash and change will then not affect the running of the database, if the RAID system is able to carry out a restore.
Every volume category should be stored on a different disk.
When using fault-tolerant hardware, it is best to only use the same type of hardware when you want to extend the capacity. For example, RAID-5 systems should only be extended using RAID-5 systems and mirroring disks with mirroring disks.
UNIX: In a production system, data volumes and log volumes should be used in conjunction with raw devices. Raw devices achieve better performance, and are more secure in the event of a system failure.