Friday, October 01, 2021

Enhanced Load Balancing Path Selection Policy

This blog post will be very short.

Few years ago I wrote the blog post about this topic. It is available here so read it for further details.

What we have today realized with my colleagues, this VMW_PSP_RR sub-policy options is enabled by default, therefore VMware Round Robin multi-pathing policy is considering I/O latency for optimal storage path selection.

The ESXi setting can be validated in ESXi shell by command

esxcfg-advcfg -g /Misc/EnablePSPLatencyPolicy 

where the output in ESXi 6.7 U3 and above is

Value of EnablePSPLatencyPolicy is 1

Note: 1 is TRUE.

This is the reason, why you can observe different traffic via different storage paths.

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