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OK, so in that case just for extra precautions:<br />
<br />
I will be putting it into maintenance mode and then run the script to change it into Round Robin mode at one go.<br />
<br />
Yes, PureStorage suggest for Round Robin (all paths Active).
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OK, so in that case just for extra precautions:

I will be putting it into maintenance mode and then run the script to change it into Round Robin mode at one go.

Yes, PureStorage suggest for Round Robin (all paths Active).

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A real test, is also check there is no VM outage, when you change over, which means, cannot be in Maintenance Mode!<br />
<br />
Should have been done before Production!
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A real test, is also check there is no VM outage, when you change over, which means, cannot be in Maintenance Mode!

Should have been done before Production!

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People,<br />
<br />
I'd like to know what will be the implication of changing the <i>Path Selection Policy </i>mode from <b>MostRecentlyUsed </b>into <b>RoundRobin</b> in regards to the current production VMs traffic &amp;&nbsp;availability ?<br />
<br />
My current Shared Storage best practice mentions that I need to use RR instead of MRU, but what will be the impact if I change the value in one ESXi using manual or scripted ?<br />
<br />
Do I need to put the host into maintenance mode first or can I do the whole ESXi servers in production in one go with Powershell script without cauisng any outage or VM disruptions ?
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People,

I'd like to know what will be the implication of changing the Path Selection Policy mode from MostRecentlyUsed into RoundRobin in regards to the current production VMs traffic & availability ?

My current Shared Storage best practice mentions that I need to use RR instead of MRU, but what will be the impact if I change the value in one ESXi using manual or scripted ?

Do I need to put the host into maintenance mode first or can I do the whole ESXi servers in production in one go with Powershell script without cauisng any outage or VM disruptions ?

Changing ESXi Path Selection Policy implications and caveats ?

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.