Specify the device size using the --devicesize option. The recommended device size is:
(4x / nd + 4l/d) / 0.99
Where
x is the total size of user data
n is the number of nodes (given by the --hosts option)
d is the number of devices per node (given by the --datadevices option)
l is the log buffer size (given by the attribute LogBufferSize)
If re-fragmentation might occur (for example, using hadbm addnodes), then the recommended device size is:
(8x / nd + 4l/d) / 0.99