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Using the appropriate hardware, operating system, or database features can improve the downtime security of a database instance.

·        Log volumes

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.

Note

See Log settings

·        Data volumes

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.

 

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