This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(96, 27%, 19%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA3%3C/text%3E%3C/svg%3E)
These questions pertain to Exchange server 2016/2019..
Is it a requirement to have enterprise licensing to deploy an Exchange DAG? I see that standard licensing only allows up to 5 mounted databases. Is that per Exchange server node or?
I read somewhere that Exchange standard databases are limited to 1Tb in size, is that accurate?
If you were to create a DAG and add another Exchange Server, then replicate those 2 databases to the new server, then each server would have 2 databases each.
That would allow you to add 3 more databases and replicate them to each server - 5 total on each.
Once they reach 1TB, you either add another DB and move mailboxes ( as long as each server has 5 or less DBs) - or - upgrade to Enterprise - then you dont care - add as many as you need DB-wise.
Oh, so my understanding was incorrect. The 5 database limit is server specific. Interesting.
It's been a while since I looked at Exchange licensing. I know we buy a standard user CAL for each mailbox. Is there an Exchange server license of some kind too? Like do you need to buy an additional Exchange license for the second server and DAG deployment or do all of your user CALs cover this?
Regards,
Adam Tyler
You can use standard exchange in a dag but that means in practical terms you can’t have more than 5 databases on each server in that dag since 5 mounted dbs max is allowed
And yes 1tb is the limit
Okay, so in our case we have 2 mounted Dbs and One Exchange server. If we were to do a DAG, then we would be duplicating those original 2 databases to 4 (would require one more Exchange server). So we are still under the limit.
However, the existing databases are now 500Gb in size each. The day they get closer to 1Tb, creating another DAG enabled Db will not be possible without going to Enterprise.
My understanding correct?
The database Copy will also occupy a place. The "5 databases" is a limitation on "active database" + "database copy".
For Exchange standard, you can't mount databases that are larger than 1024 GB. There is no default database size limit for the Enterprise Edition. You could have a look about this article.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
You have server licenses and CALs:
https://www.microsoft.com/en-us/microsoft-365/exchange/microsoft-exchange-server-licensing-licensing-overview