On Mon, Sep 30, 2024 at 11:04:30AM +0100, Tim Sauerbein wrote:
>
> > On 30 Sep 2024, at 06:23, Joachim Kraftmayer <joachim.kraftmayer@xxxxxxxxx> wrote:
> >
> > do you see the behaviour across all devices or does it only affect one type/manufacturer?
>
> All devices are affected equally, every time one or two random ODSs report slow ops. So I don't think the SSDs are to blame.
One cause for "slow ops" I discovered are networking issues. I had slow
ops across my entire cluster (interconnected with 10G). Turns out the
switch was bad an achieved < 10 MBit/s on one of the 10G links.
Replaced the switch, tested the links again - got full 10G connectivity
and the slow ops disappeared.
_This_ one was easy to test for: just run iperf3 across your links.
Of course, there are plenty of other possible causes ..
Kind regards,
Alex.
--
"Opportunity is missed by most people because it is dressed in overalls and
looks like work." -- Thomas A. Edison
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