5 Replies Latest reply on Jul 19, 2017 7:27 AM by continuum

    Thin disk faster then thick eager zeroed

    alexnik108 Novice

      Hi,

      any one can explain me why thin disk works faster then thick eager zeroed on same datastore ?

       

      THIN:

      fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75

      Jobs: 1 (f=1): [m(1)] [100.0% done] [284.3MB/96892KB/0KB /s] [72.8K/24.3K/0 iops] [eta 00m:00s]

      test: (groupid=0, jobs=1): err= 0: pid=4133: Sun Jul 16 22:27:32 2017

        read : io=3071.7MB, bw=289577KB/s, iops=72394, runt= 10862msec

        write: io=1024.4MB, bw=96567KB/s, iops=24141, runt= 10862msec

       

       

      THICK:

        read : io=3071.7MB, bw=172067KB/s, iops=43016, runt= 18280msec

        write: io=1024.4MB, bw=57381KB/s, iops=14345, runt= 18280msec

       

       

      What a mystic?

       

      Datastore located on 4x SSD, RAID: 0, VMFS6, ESXI 6.5