First, ignite will take all space that is configured in a data region. if
there's more data then data region can store it will write data to a disk.
However, it's about off-heap memory only, it doesn't use the heap for data
storing(at least by default).
How to configure data region size you can read here:

So you need to sum jvm heap size, off-heap size and memory for OS and tools
and this sum must be < total memory your box has.


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