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8 Expanding Disk Storage

The total storage space in use for these two servers is 350GB. The system

administrator must factor in an estimated storage space growth of 10 percent

over the next four years resulting in approximately 500GB of data that must

be protected.

The "Allocating Space for Protection Groups" section in Planning a System

Center Data Protection Manager 2007 Deployment describes the methodology

DPM uses to allocate space requirements for protection groups. Using

computations based on 500GB of protected data results in the following

estimates:

From the above example, five 250GB drives provide 1TB of usable storage

space. In a RAID 5 configuration, the space equivalent of one physical disk

stores parity data used to recover data in case of single disk failure.

Approximately 250GB of the total disk space is dedicated to parity. The

available space for DPM's data pool is four times 250GB, or 1TB total

(Figure 2-1).

NOTE: The parity data is distributed across all of the physical disks. The total space

used for parity equals one physical disk.

Figure 2-1. Logical View of Disk Space Usage in a RAID 5 Group of N Physical Disks

Storage space for the initial (replica) backup 623GB

Storage space for recovery points 376GB

Total additional DPM space (estimated) 1TB

1 2 N - 1 N(Parity)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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Dell PowerVault DP600 Manual do Utilizador Página 8