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Slow performance?


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Hello all!

Trying to diagnose why the performance of my setup is slower than expected.

Have 10x 8TB SAS drives connected through a SAS expander to a typical LSI 8 Channel HBA.

Previously when using SATA based driver performance was stellar and during parity operations I could achieve well over 1.5GB/sec

With these SAS drives I appear to be hitting some sort of bottleneck.

Only maxing out at around 900MB/s total transfer rate.

Each drive when tested alone can achieve over 200MB/s.


Adding 4 drives directly to the HBA and bypassing the expander shows no change at all.

If I do a scrub of a set of 3 SAS 15K cache drives running on the same setup the speed of this is very slow.

Once pausing the parity check the performance shoots over 700MB/s which is the expected speed of these drives.

 

Have run out of things to try and am now here to find help!

I hope someone can figure out where the bottleneck of my system is.

Thanks all!


Have attached diagnostics.

big-server-diagnostics-20221022-0038.zip

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