A potential customer is evaluating an EMC Avamar system as a backup solution. After initial
sizing, they added a requirement to encrypt all backup data on the Avamar system. The original
sizing documents indicated that the customer required 54 TB of storage capacity.
What is the total amount of storage required to support the performance impact of the encryption?
A.
54 TB
B.
64 TB
C.
72 TB
D.
81 TB
54TB is the total amount of storage and the 65% “read only” limit is 35.1TB (54*.65). So the customer needed 35.1 TB without encryption. But since they now want encryption, and they still need the 35.1 TB to do backups, then we use the 43% “read only” limit. The new total would be 35.1/.43 = 81TB.
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See technical deployment considerations for service providers page 27. The overhead for encryption is 30%. Avamar 61 product security guide page 79. The overhead is 33%.
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The correct answer is b.
(54*0.65)=35.1, there are 18.9 reserved for chk overhead.
35.1 * 1.30 (the 30% of encryption overhead)= 45.63
Answer: 45.63 + 18.9 = 64.53
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which is right?
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