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September 15, 2008

Q. What volume sizes do I need for my Active Directory?


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A. There are essentially three units of space used for Active Directory (AD): the AD database itself, the log files generated for the database, and the SYSVOL content.

For environments where you have more than 1,000 users accessing a domain controller (DC), you should separate the AD database/SYSVOL from the AD logs—so you’ll need two separate volumes. (It’s recommended to leave the AD database and SYSVOL on the same volume.)

For the AD database, the volume size will be based on the number of objects, roughly 400MB for every 1,000 users, allowing an additional amount to accommodate expected growth. SYSVOL should usually have at least 500MB of space allocated.

The log volume size should be the total size of the log files plus 20 percent, or 500MB, whichever is larger. There shouldn’t be many log files in a normal environment because AD logging is circular—that is, after the log file is committed to AD, it’s removed. This means that unless you have a huge number of changes to AD, a couple gigabytes for the log volume will probably be plenty.

End of Article



Reader Comments
John, Microsoft also keeps advising the same: place the log files in a separate hard disk. But I think this is a useless advice because we generally use hardware RAID 5 volumes on the servers and you cannot differentiate which volume is on which hard disk. All the RAID 5 structure is isolated from the operating system.

muraty September 15, 2008 (Article Rating: )


Murat, thanks for your feedback. I forwarded it to John Savill; here's his reply: "The physical protection is great against a disk failure. But in the event of some logical file system corruption, RAID will not help you, which is why it is critical to separate the database from the logs."

AnneG_editor September 16, 2008 (Article Rating: )


anne, john's reply is meaningless because you can not obtain anything in case of logical file system corruption. The reason lies in the John's article: log files are circular. So they cannot be used in database recovery.

muraty September 18, 2008 (Article Rating: )


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