Exchange Mailbox Move Process

Can anyone please explain the process behind exchange mailbox movement for me or if you guys guild me to any source that explains it. I have not found any solid source to able to explain that in details.
I have written a power shell tool that re balances the mailboxes across all databases since i have added new databases and dag members into our exchange organization as part of expansion. disk sizes are obviously exact same size, however, it seems that during the move it takes larger disk size then a steady mailbox would  normally take. for example all databases need to have 339 mailboxes while before they were way above 400 one of the drives that the mailboxes moving to the database on that drive right now is about 90% space taken already, while the move is still in progress.
so if  you guys can explain the move process and how it actually work in the background that will help me understand how many move should i initiate at a time and better understand provisioning of the disks. another issue is that this organization has disks provisioned thin
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Riaz Alexander AnsaryEnterprise Infrastructure Systems EngineerAsked:
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timgreen7077Exchange EngineerCommented:
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Todd NelsonSystems EngineerCommented:
IMO, it sounds to me that you are creating more work for yourself than the effort is worth by maintaining a specific number of mailboxes per DB.

another issue is that this organization has disks provisioned thin

I know this isn't your question, but it caught my eye. Virtual Exchange servers must be built exactly like a physical server--with fixed disks, memory, etc.

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Riaz Alexander AnsaryEnterprise Infrastructure Systems EngineerAuthor Commented:
Todd, thanks a lot for catching that, and yes that is what i told them when I found out it was thin and asked the storage team to change that. the reason i am moving mailboxes around was that expanded the exchange size by adding 3 more servers to the dag and more databases, that is why i write a tool to redistribute mailboxes evenly to databases including the new ones that had 0
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timgreen7077Exchange EngineerCommented:
Need to reclose with points being awarded to Todd as accepted and Tim as assisted
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timgreen7077Exchange EngineerCommented:
Need to reclose with points being awarded to Todd as accepted and Tim as assisted
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timgreen7077Exchange EngineerCommented:
Provided answers to user questions, and user acknowledge @Todd suggestion also.
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