Hi Jens, I am using the below job file, and this works fine when the numjobs is less(ex: 5,10) however when I specify a huge numjobs , the job hangs and shows a huge eta as shown below. # fio FIO_Test.job test: (g=0): rw=randrw, bs=71K-71K/20K-20K/20K-20K, ioengine=posixaio, iodepth=32 ... fio-2.1.10 Starting 20 processes Killed1 (f=1): [__________________m_] [0.0% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta 1158050441d:06h:50m:07s] When I just run a 100% Reads (71K) or 100% writes(20K) separately with the below below parameters it works fine, but it is only when i do a mix of reads and writes. Any idea what is going on and if i am missing something? OS:RHEL7 HDDs(sdf):2x300GB Hdds on RAID10 [test] name=test ioengine=posixaio invalidate=1 iodepth=32 bs=71K,20K group_reporting=1 rw=randrw rwmixread=96 rwmixwrite=4 direct=1 buffered=0 size=1M time_based runtime=300 filename=/dev/sdf numjobs=64 Please help!! Thanks -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html