A customer has been using lz Local Compression when backing up their data to an EMC
Data Domain system. An audit of their storage content shows that they can effectively use
gz compression for their data. What should be considered before changing the Local
Compression type?
A.
Overall system performance will improve with the new compression
B.
Existing data will not be recompressed; only new data will be gz compressed
C.
New compression on the old data will not take effect until the next system cleaning
D.
Changes must be made at the beginning of a 20-hour backup window
The answer is b
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C
Changing the local compression algorithm leads to a long cleaning cycle, since all existing data will need to be read, uncompressed, then re-compressed. After you change the compression, all new writes use the new compression type.
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