All systems in the same location should be on the same LAN for maximum performance. Use the 100TX network to connect all the systems in each of the locations and the WAN to connect the cells in the three locations. The 100TX network has a sustained data transfer rate of 10 MB/s, or 36 GB/h, of data.

•Backup Devices

The backup devices consist of an HP StorageWorks DLT 4228w Library for ABC Cape Town and two HP StorageWorks DLT 4115w Libraries for ABC Pretoria and ABC Durban as well as 7 HP StorageWorks DAT24 autoloaders for backing up the IDB and configuration files in all the cells and 2 HP StorageWorks DAT24 autoloaders for backing up the Microsoft SQL database and the Microsoft Exchange database at ABC Cape Town. The Microsoft Exchange Server and the Microsoft SQL Server currently consist of 15 GB and 11 GB of data, respectively, while the rest of the data (100 GB -15 GB - 11 GB = 74 GB) is backed up using the three SAP database servers.

Why use the HP StorageWorks DLT 4228w Library?

•The HP StorageWorks DLT 4228w Library has two DLT4000 drive with 28 slots. It has a total compressed storage capacity of 1.1 TB and a maximum sustained data transfer rate of 6 MB/s (2 x 3 MB/s), or 21 GB/h, with data compression. This is the transfer rate assumed for the remainder of this section. Currently, the total amount of data to be backed up to the HP StorageWorks DLT 4228w Library as a full backup, whether this is a single full backup, or the staggering approach is used, is about 74 GB. Assuming that the size of an incremental backup is approximately 5% of that of a full backup, a backup generation, representing a full backup and all incremental backups based on this full backup, requires (74+74*5%*5) GB, or 92.5 GB, of library space. In five years time, this figure is projected to increase to about 230 GB. ABC’s backup policy requires that three backup generations of data be kept. Therefore, 230*3 GB, or 690 GB, of library space will be required for storage. The HP StorageWorks DLT 4228w Library’s 1.1 TB GB storage capacity therefore suffices.

The library at ABC Cape Town is shared among the three cells at the location. The library at the ABC Pretoria environment is shared between cells D and E, while that at ABC Durban is shared between cells F and G. Such a configuration requires the use of the Data Protector Centralized Media Management Database in each of the three MoM environments. These databases are configured on the Manager-of-Managers of cells A, D, and F.

Concepts guide

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