[lustre-discuss] Why reads are slower than writes on lustre file system?

Nagmat Nazarov nagmat at nevada.unr.edu
Mon Sep 27 15:57:31 PDT 2021

Dear Engineers,

I have started working on a lustre file system. I have done couple of
experiments so far:
On the first experiment I am writing 100 files each 10MB and the batch size
is 4K. I got 107MB/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 bandwidth is 106MB/s
while  read average bandwidth is 59MB/s which is very weird I guess?

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 1Gb/s.

Kind regards
Nagmat Nazarov
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