Exchange 2010 message queued

Hi,

I am using exchange 2010 with sp3 on a single server with transport/client access/ mailbox roles on it.  The server is running on windows 2012 /32G memory / 2 socket 16 core processor. The current mailbox database size is 900GB ( single database)

Question is: when i am running the windows backup(wbadmin), the message queued for delivery shoots up and some email delays are up to 30 mins. this is consistent every time i'm doing a windows backup.  can you help me pinpoint the cause of email delays during this time?
1D01707K170WAsked:
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Nick RhodeIT DirectorCommented:
Windows Backup uses VSS to take a snapshot so it should not necessarily affect/take exchange down but you will experience a degrade in performance from exchange while it is being backed up.  I have seen Windows Backups take exchange down to a crawl and when it finishes everything returns to normal.  900GB is a decent size database to backup and what I would do it try running the backup without exchange and narrow it down.
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1D01707K170WAuthor Commented:
what do you mean by "running the the backup without exchange"?

additional info: the database volume is on the SAN storage via iSCSI connection.
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Mohammed HamadaSenior IT ConsultantCommented:
I suggest that you create another Database and move mailboxes to it! 900GB is too much for a single database and it's not even recommended ..

Database has limits as documented by Microsoft. check this link..

https://social.technet.microsoft.com/Forums/exchange/en-US/48431bab-4049-47db-9a84-359d5123d247/what-is-the-maximum-supported-database-size-in-exchange-2010-?forum=exchange2010
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