Use
This section describes how a Logical Volume Manager (LVM) influences the
optimization of file distribution during an Oracle database backup.If you use an LVM, BRBACKUP can only save all files from a hard disk to tape if the logical volumes are not scattered over several hard disks. Configuration A of the graphic below is better suited for backup with an LVM.
Features
Configuration A
Each logical volume exactly corresponds to one hard disk. For example logical volume 1 = disk 1, logical volume 2 = disk 2, logical volume 3 = disk 3.
Configuration B
Each logical volume is set up so that it covers areas of all the hard disks:
Configuration A is more efficient than configuration B with respect to database backup. However, configuration B can provide better performance for online operation of the SAP system.
Activities
When planning the configuration of logical volumes for large databases, you need to find a compromise between the following:
Consider the following factors:
Easier administration, high flexibility, higher security by using RAID systems
Performance loss through management overhead and possibly – in configuration B – reduced optimization with BRBACKUP