Bug: Partest and posix I/O, can't read header
on Jugene: mpirun -env "BG_MAPPING=TXYZ" -mode VN -np 128 -env DCMF_RECFIFO=33554432 -env BG_MAPPING=XYZT -env SION_SERBLOCKSIZE=512 -env SION_COLLSIZE=0 -env SION_COLLDEBUG=3 -exe /work/zam/zdv087/sion/SION_IBM-BGP-Jugene_Collective_i001011/n1p512t1_t003_i01/SION_IBM-BGP-Jugene_cname_IBM-BGP-Jugene.exe -args "--verbose=1 --filename=/work/zam/zdv087/siondata/SION_IBM-BGP-Jugene_Collective_i001011.n1p512t1_t003_i01/SION_IBM-BGP-Jugene_Collective_i001011.n1p512t1_t003_i01.dat --unlinkfiles=1 --testtype=0 --factor=0.0 --bufsize=32Mb --chunksize=-1 --totalsize=-1 --localsize=3Mb --fsblksize=4Mb --bgionode=1 --bgtaskperionode=0 --numfiles=1 --taskoffset=512 --hintlargeblock=-1 --hintiobufsize=-1 --hintsparseacess=-1 --byteoffset=0 --debugtask=1 --Debugtask=1 --serialized=-1 --collwrite=1 --collread=1 --posix=1"