Disk per database

[DaveC]

Is there a way to configure MongoDB such that each database may be stored on a different disk?  Here is why:

I have a multi-tenant system, and I am isolating customer data by database.  A customer has free reign over their database.  Customers pay for the amount of disk space they consume, along with the I/O.  At the OS level, I can't really track the I/O on a file by file basis, so I would like to put each customer database on a particular storage volume.  However, I can't find a way to do this unless I create a separate instance of MongoDB for each customer.  Is there an option I'm missing?

Thanks.

[Octavian Covalschi]

You can tell mongodb to create a directory per database, this way you can create a symbolic link to each database...

http://docs.mongodb.org/manual/reference/mongod/#cmdoption-mongod--directoryperdb

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