D-PDD-DY-23 practice question 1 of 15

What is a characteristic of the Global-Compression Factor?

Full set: 91 questions

Answer options

A: It measures the data reduction effect of the compression algorithms. Correct answer

B: It displays the amount of storage that the system uses after data reduction.

C: It is a product of the global compression and local compression factors.

D: It measures the data reduction effect of deduplication.

Correct Answer:

A. It measures the data reduction effect of the compression algorithms.

Explanation

Within PowerProtect DD, the Global-Compression Factor expresses how much further the unique data segments (after deduplication) are reduced by the inline compression algorithms (LZ, LZR). It therefore measures the storage-saving effect attributable solely to compression, independent of deduplication.

Why Incorrect

B. Shows post-reduction space, not the factor itself.
C. Local and global factors are separate metrics; no “product” relationship.
D. Deduplication savings are reflected in the Global-Deduplication Factor, not the Global-Compression Factor.

References

1. Dell EMC PowerProtect DD OS Administration Guide, Version 7.10, §“filesys show compression”, pp. 101-103 – defines Global-Compression as “reduction from compression algorithms”.

2. Dell EMC Knowledgebase article 000058621, para. 2 – distinguishes deduplication and compression factors.

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