HP B6960-96035 - Manual (Page 323)

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 323