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Exchange 2007 Database file system filling up (Whitespace available)

Last Modified: 2015-08-15
Here is my scenario that I inherited:

i have a CCR Exchange 2007 configuration running on Windows 2008 that wee are getting ready (30-60 days) to move to Office 365.
I have a database that is 639 GB on a drive that only has 650 GB of space.  Transaction logs are on a different drive so that is not an issue.  There is over 50GB of Whitespace.  The only other thing on the drive is the CalatogData folder which is 10 GB.  Yes, there is only 1 GB of space on the Drive remaining.  The good news is that the DB is not growing.  We are slowly mailboxes off the Database to other mailboxes and to Office 365 (But it is going VERY Slowly).  Again, my issue is not whitespace, I don't expect the DB to grow at all.  The company is very short on Storage, so I really can't extend the drive or move the database to another drive.  We also cannot incur any downtime.  I am really looking for a short term solution until we complete the migration.  As we migrate, the database will continue to shrink, but of course the file system will not (and I can't do an offline defrag).  Here are my questions.

1. What happens when the file system drive fills, but the database has plenty of room (Will the database dismount?)
2.  I know that I can disable search indexing on that database and that would give me the 10GB back.  My question is what is the hit on the performance / functionality part.
3.  Can I prevent the Catalog data folder from continuing to grow?  It is growing at about .1 GB every couple of days.
4.  I also know that I can stop the Search indexing service and delete the catalogdata folder, but when I restart the service it will start growing again. Is there a way to move the catalogdata folder to another drive.

Again, looking for a temporary solution that will last 30-60 days that will not require any offline time for Exchange.  The hardware on this server is old and it is very much under powered,


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