Exchange 2013 Database Whitespace

This is Exchange 2013 with DAG setup, so I know reclaiming whitespace isn't an option. The problem I have is the amount of time required to procure more capacity in the SAN and keeping the drive from running out of space. There are two databases on separate Windows partitions.

E: 2 TB with 50 GB Free - DB1
F: 950 GB with 125 GB Free - DB2

Will migrating mailboxes from DB1 to DB2 slow the growth of DB1 by creating whitespace, or is that whitespace completely unusable without a defrag?
KapsZ28Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Will migrating mailboxes from DB1 to DB2 slow the growth of DB1 by creating whitespace, or is that whitespace completely unusable without a defrag?

This is correct. Whitespace is reclaimed only after Online Maintenance has Completed. So your database will continue to grow during the day with new mail committed to the database but once online maintenance runs if there is any whitespace available it is get used first before using a different area on the disk which increases the over all size of the mailbox.

Will.
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KapsZ28Author Commented:
I found this when searching the Internet.

"The days of online maintenance killing itself trying to defragment partially filled 4K pages of data to be on a single ESE page are gone.  The same goes for offline defragmentation.  We now live in a world where large mailboxes are the norm and any white space will be quickly re-used. Also consider that many organisations are now running 24 * 7, and it is hard to justify the impact caused by taking a database offline."

I am hoping that is the answer to my question. Any white space created by migrating mailboxes from DB1 to DB2 will end up being reused by growing mailboxes and therefore keep DB1 at the same size for now.
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