Server 2012 R2 domain controllers and log files

we have someone installing a fortigate device for content filtering.  he is asking me to turn on success logging in my domain controllers.  this leads me to ask several questions:

1.  Do I turn on success logging for both the default domain policy AND the default domain controller policy or just one?

2.  Isn't that a crap load of extra logging?  

3.  What is considered too big for logging file sizes?  Mine are already 4 gigs and they are over writing multiple times a day.  I don't want to grow the log too big and 4gigs for a text logging file seems massive.  What are my limits?  What are some good rules of thumb for DC logging file sizes?

4.  What else do I need to know here?

Basically, for content filtering on the internet, I have never seen an appliance require this and I'm hesitant to log this as we have over 600 users in the domain.  I don't want my security logs to be 4gigs and I don't want my DC logging the crap out of everything just because this deivce sucks and can't do it's job correctly.

Thoughts?

Thanks

Cliff
crp0499CEOAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
This really all depends on what you want to audit. If you want to specifically audit AD access/changes/login etc then you need to enable this on the default domain controller policy. I have ceated a HowTo on my site to accomplish this.

I have all of the required steps also with post best practices once it is enabled.

http://www.wsit.ca/how-tos/active-directory/configure-active-directory-auditing/

Will.
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crp0499CEOAuthor Commented:
I think my point is I was asked to turn on success auditing for user and computer logon accounts.  as a result, my log file is 4 gigs.  That seems crazy to me.  it's over writing more than once per day so less than one days of log files doesn't help me.

can I bump it to 16 gigs?  that just seems crazy to even ask.
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Will SzymkowskiSenior Solution ArchitectCommented:
I cannot find any "microsoft" documentation stating recommendations of Security Log File size, however I have over 30,000 users in the AD environment that i manage and each of my DC's have a security log of 1GB. I do my log collections to my logging server every 5 minutes.

I would not recommend that you increase this log size rather increase the amount of time that your logging server fetches the security log data.

Will.
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