Home » EMC » E20-598 » How many chunks will be compressed prior to hashing?
The EMC Avamar client needs to backup a file and has performed sticky-byte factoring. This results in the following:
– Seven (7) chunks that will compress at 30%
– Four (4) that will compress at 23%
– Two (2) chunks at 50% compression
How many chunks will be compressed prior to hashing?
A. 4
B. 7
C. 9
D. 13
Correct Answer: C
Explanation/Reference:
Explanation:
vamar, has a rather nifty technology called Sticky Byte Factoring which allows it to identify the changed information inside a file by breaking the file into variable length objects, this leads to much greater efficiency than fixed size approaches as changes made early in a fixed length sequence affect all subsequent blocks/chunks/objects/whatever in that sequence. This in turn changes all the fingerprints taken following the changed data which means you end up with a lot of new blocks/chunks/objects/whatever even if the data really hasn’t changed all that much. Sticky Byte Factoring on the other hand can tell what exactly has changed, not just that things have changed.
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