On Thu, Jul 04, 2019 at 09:39:18AM +0200, Roberto Ragusa (mail at robertoragusa.it) wrote: > On 7/4/19 8:43 AM, Jobst Schmalenbach wrote: > >Clearly the development server is hardware wise way below the specs of the Dell but > >software wise they are identical (they get upgraded at the same time). > As a first step, you have to test subsystems one by one. Thank you for the tips. Here are the results (DELL is faster overall): > time dd 2>/dev/null if=/dev/zero of=/dev/null bs=1 count=1000000 [DIY ~] #>time dd 2>/dev/null if=/dev/zero of=/dev/null bs=1 count=1000000 real 0m1.931s user 0m1.022s sys 0m0.896s [DELL ~] #>time dd 2>/dev/null if=/dev/zero of=/dev/null bs=1 count=1000000 real 0m1.308s user 0m0.389s sys 0m0.919s Dell faster overall > cd /a/directory/on/the/filesystem/you/want/to/test > time bash -c "for((i=0;i<1000;i++)); do dd 2>/dev/null if=/dev/zero of=test bs=1 count=1 conv=fsync;done" > rm test [DIY /mnt] #>time bash -c "for((i=0;i<1000;i++)); do dd 2>/dev/null if=/dev/zero of=test bs=1 count=1 conv=fsync;done" real 1m12.944s user 0m1.604s sys 0m2.595s [DELL /mnt] #>time bash -c "for((i=0;i<1000;i++)); do dd 2>/dev/null if=/dev/zero of=test bs=1 count=1 conv=fsync;done" real 0m2.270s user 0m0.509s sys 0m1.475s Expected the DIY to be slower here, it's running MDADM RAID1 on Seagete Spinners compared to LSI RAID1 SSD The result shows the DELL overall is faster, back to the drawing board after I followed all the other hints in this thread. Jobst