[lustre-discuss] Why reads are slower than writes in lustre

Nagmat Nazarov nagmat at nevada.unr.edu
Tue Sep 28 16:51:45 PDT 2021

Dear Engineers,

I have started working on a lustre file system. I have done a couple of
experiments so far:
On the first experiment I am writing 100 files each 10MB and the batch size
is 4K. I got *704MB/s* bandwidth.

On the second experiment I am (writing 10 files each 10MB and reading 1 10
MB file back) for 10 times.  Here also the average write bandwidth is
*697MB/s* while  read average bandwidth is *380MB/s* which is very weird I

Experiment files are on :
I am using FIO as workload generator : *https://github.com/axboe/fio
<https://github.com/axboe/fio> *

My question is, generally on ext4 file systems read average bandwidth is
faster that write average bandwidth, why is it *2 times slower *on lustre
file system. My ethernet speed is *10000Mb/s.*

Kind regards
Nagmat Nazarov
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