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Query regarding question in E20-816 practice test

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In the practice test for the exam E20-816, there is a question:

A customer is implementing an Exchange 2010 environment for 500 users on an EMC Symmetrix VMAX and has the following requirements:

- 1 GB mailbox quota per user.

- Each user sends and receives approximately 125 messages per day.

- The average message size is 65 KB.

- Deleted items will be retained for 14 days.

- Content indexing will be enabled.

The customer would like to size the database allowing for 20% growth. What is the minimum capacity recommended to support the customer's environment?

Can anyone please assist in deducing the outcome of this question ?

Thanks in advance

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Re: Query regarding question in E20-816 practice test

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Your calculations are correct. The eLearning module goes into the details of the calculation as you have shown above.
The key is to make sure to account for Whitespace, Dumpster ..., growth etc...

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Re: Query regarding question in E20-816 practice test

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What is your current understanding of the question? It helps to share your thought process so other can provide a better answer.

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Re: Query regarding question in E20-816 practice test

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Good idea Kate.

In order to size any storage array for an Exchange 2010 environment we require the following-

     1)Total # of users

     2)User I/O profile or # of messages sent/received per day

     3)Mailbox size limit

     4)Read/Write ratio

     5)Average message size

     6)Deleted items retention policy

     7)User concurrency requirements

     8)Log protection buffer

     9)Is replication requested ?

     10)RPO/RTO

In the aforementioned question, 5 out of the 10 metrics are provided which is okay since we need to calculate the minimum net capacity accounting 20% growth factor

Database size = (Total # of users)*(mailbox size on disk)*(database overhead growth factor)

Total # of users = 500

Mailbox size on disk = mailbox size limit + whitespace + dumpster    

    mailbox size limit = 1GB = 1024MB

    whitespace = (# of messages sent/received per day)*(Average message size)

                     = (125)*(65/1024)

                      ~ 8MB

    dumpster = ((# of messages sent/received per day)*(Average message size)*(Deleted items retention policy)) + (mailbox                        size limit*0.012) + (mailbox size limit*0.03)

                   = 111 + 12.29 + 30.72

                   = 154MB

Mailbox size on disk = mailbox size limit + whitespace + dumpster = 1024 + 8 + 154 = 1186MB

Database overhead growth factor = 1.2 (20% growth)

Database size = 500*1186*1.2

                      = 711600MB

Now, as per the question "Content indexing will be enabled". Thus, another 10% of capacity is to be added.

Database size = 711600*1.1

                      = 782760MB ~ 765GB

The option, in the question, closest to the attained output is 800GB.

Kindly correct me if I've got it wrong.

Thanks in advance !!!

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Re: Query regarding question in E20-816 practice test

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Your calculations are correct. The eLearning module goes into the details of the calculation as you have shown above.
The key is to make sure to account for Whitespace, Dumpster ..., growth etc...

View solution in original post

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Re: Query regarding question in E20-816 practice test

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Thank you sir

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