Exchange 2013 Content Indexes filling up drives

I have an issue with my Exchange 2013 on 2012R2. The Content index files \ms\%default folder are consuming a large amount of space. We have a DAG with 3 databases.

DB1 - Size: 294GB, Index files are 140GB.
DB2 - Size: 29.53GB, Index files are 2.95GB.
DB3 - Size 128GB, Index files are 43.23.

With some searching I found that the DB1, and DB2 index folders seem to be a normal size which is 10% to 20%  ish of the size of the db. However, DB1 is closer to 50%. I have attempted a restart and update of the servers in the DAG, they seem to be growing faster than I can give disk space.
Brandon MillerSystems AdministratorAsked:
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viktor grantExchange ServersCommented:
Hi Brandon,

What are the status of the index?

When you run Get-MailboxDatabaseCopyStatus *

It is healthy status?

You can try to rebuild the index.

Brandon MillerSystems AdministratorAuthor Commented:
I have not attempted to rebuild the index I have never attempted this on a dag. Is there a TechNet article for reference on doing this on a dag a quick search didn't really give me any good results.

They all look health, sorry missed a database in my earlier post.

Name                                          Status          CopyQueue ReplayQueue LastInspectedLogTime   ContentIndex
                                                              Length    Length                             State
----                                          ------          --------- ----------- --------------------   ------------
DB1\MAIL                              Mounted         0         0                                  Healthy
DB2\MAIL                               Healthy         0         0           11/30/2017 2:15:35 PM  Healthy
DB3\MAIL                             Healthy         0         1           11/30/2017 2:16:07 PM  Healthy
DB4\MAIL                                  Healthy         0         1           11/30/2017 2:16:06 PM  Healthy
SODB\MAIL                         Mounted         0         0                                  Healthy
DB4\MAIL3                                 Mounted         0         0                                  Healthy
DB2\MAIL3                              Healthy         0         0           11/30/2017 2:15:35 PM  Healthy
DB3\MAIL3                            Healthy         0         1           11/30/2017 2:16:07 PM  Healthy
DB1\MAIL3                             Healthy         0         1           11/30/2017 2:16:06 PM  Healthy
DB4\MAIL2                                 Healthy         0         1           11/30/2017 2:16:06 PM  Healthy
DB3\MAIL2                            Mounted         0         0                                  Healthy
DB2\MAIL2                              Mounted         0         0                                  Healthy
DB1\CMAIL2                             Healthy         0         1           11/30/2017 2:16:06 PM  Healthy
viktor grantExchange ServersCommented:
Hi Brandon,

Yes rebuild the index in a DAG:

Update-MailboxDatabaseCopy -Identity "name of database" -CatalogOnly


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AmitIT ArchitectCommented:
From DB size, I first see, you are not distributing the mailboxes properly on each db. Next, this is know issue since Exchange 2007. Rebuilding indexing fixes most of the times. However, in worst case, you might end up recreating DB itself. I assume db drives and bin folders are excluded from Antivirus.

In your case, best you move mailboxes to other db's and recreate this db again.
Brandon MillerSystems AdministratorAuthor Commented:
Has anyone on here ever tried to re index a passive copy of a DB then move the active copy and reseed the indexes to the other DAG members?
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