Exchange 2010 - Message Tracking, Database Log File Growth.

Hey Guys,

 I have an issue where during any 12 hour period (Mon-Fri) one of our database with about 700 Mailboxes generates an astounding 75GB of log files (in 12 hours). We contacted Microsoft and got some pointers but unfortunately the issue wasn't resolved. Skipping forward several months...

I now believe that I have nailed the issue down to the following:

1) Users are sending attachments that range in sizes from 5MB to 50MB

2) Users are sending to 10 or more recipients

My question is simple (and I think I know the answer) I just want to confirm it:


 Message Size (Total Bytes) + Recipient Count = Actual amount of data that has been generated by exchange for the email that was sent?

Here is an example: (From out log files)



user1, user2, user3, user4, user5 @


New email


something.pdf (6mb)

Total-Bytes, 6MB

Recipient Count 10

Does that mean that the actual amount of log files generated is Total Bytes x Recipient count? = in this case 60MB for a 6MB attachment. ?


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AmitIT ArchitectCommented:
Lot of factors involved in log generation. Attachment surely plays major role. As that increase the message size. There is a formula to calculate it in this KB, read log capacity section.

You can also use Exchange 2010 calculator to find rough estimate of log generation.
castellansolutionsAuthor Commented:
No I have run through the storage calculators. I can do that again its no problem. But what I need to know is this:

Total Bytes (Of the message) x Number of Recipients = The amount of log bytes generated by that one message? Does it scale that way ?

AmitIT ArchitectCommented:
I will reply it Tomm...
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castellansolutionsAuthor Commented:
castellansolutionsAuthor Commented:
any luck on final confirmation on this question?

AmitIT ArchitectCommented:
Log are generated on message size not Number of Recipients. Read log capacity section in MS link, I gave above. With each message size log generation varies.

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