Re: ceph luminous - performance IOPS vs throughput

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

The tests are pretty clearly using different op sizes there. I believe the default is 16*4MB, but the first one is using 32*4KB. So obviously the curves are very different!

On Mon, Feb 5, 2018 at 6:47 AM Steven Vacaroaia <stef97@xxxxxxxxx> wrote:

Hi,

I noticed a severe inverse correlation between IOPS and throughput 

For example:

 running rados bench write  with t=32 shows and average IOPS  1426 

 and bandwidth 5.5 MB/sec 

running it with default ( t = 16 ) average IOPS is 49 and bandwidth is 200 MB/s

Is this expected behavior ?

How do I increase bandwidth without impacting IOPS ?

Note

Nothing "red" on atop

No customization in ceph.conf or sysctl.conf 

The test I ran using replication = 2 and only 2 OSD s 

Steven  

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