Compute schur complement with Pardiso in out-of-core mode

Hi,

I'm using pardiso_64 with intel mkl 11.3.3.1.

I am computing the Schur complement of SPD matrices (mtype = 2). In in-core mode everything is OK. In out-of-core mode (iparm(60)=2), I get no error code, but just an all-zero solution matrix. 

My iparm array is as follows: 
iparm(1) = 1;
iparm(10)=8;
iparm(21)=1;
iparm(35)=1; 
iparm(60)=2;

(otherwise zero values).

I've set the phase parameter to 12.

Am I doing something wrong, or is only in-core mode possible for Schur complement calculation?

Best,
Jens