Two types of data backup exist on BS2000 systems:
The following recommendations apply irrespective of the backup method:
Use of state-of-the-art, high-speed storage systems with FBA disks D3435 and data format NK2. These disks can be operated with an IO length of up to 480 KB.
Use storage systems with as large a cache as possible. The size selected should ensure that the read hit rates in OLTP mode are 60 - 80%.
Multipath connection of the storage systems to the server.
Use of RAID level RAID 1/0, RAID 5, or RAID 6 (see section "Replication: volume-based mirroring for storage systems"). This also enables “large” volumes (more than 32 GB in size) to be used RAID 1 is not very suitable for data backup.
Use of DPAV (dynamic PAV) in BS2000 on /390 servers.