-tmpdir

Hello all, 

I am trying to split the scratch in two:

-700GB on E:\scratch drive (SSD) which has 900 GB free,

-and on \scratch drive (HHD) which has 3400 GB free. 

The run is launched with the run options:

-tmpdir filesize=700,E:\scratch -tmpdir slow=1,D:\scratch

in the idea of first using the space on the quicker SSD E: drive and the rest on the slower HDD drive. 

The analysis stops with the E: drive filled out of space. It is like regardless of the options specified both drives are filled simultaneously. 

Adding SYSSETTING, SCRFMODE,STRIPE makes no difference.

Am I missing something? 

Thank you