Insufficient System Resources

Hi.

Have - 2xCAS, 2xDAG

When i start migrate 10-20 mailbox from one base to another i get error in queue: Insufficient System Resources (the disk with database have no less 30% free space) and mail flow stopped.

Then i make more free space on disk with database and error disappear.

I think what need no less 5% of free space for normal work of DAG, really? But i have 30%.

What wrong?

Thanks.