Speaking from experience, I prefer that the OS image being used is stored in primary and you boot from there. The only reason I do this is if a stack has some kind of issue and a unit splits. Having everything boot from primary makes it a bit easier to recover should something go wrong. Other than that, there is no real best practice. Also, the configuration is stored in a completely separate file; it is not tied to primary/secondary flash partitions. You can see this in 'show files'
Ben Beck, RCNA, RCNI, Principal Technical Support Engineer support.ruckuswireless.com/contact-us
As a best practice, I run switch code on all devices unless I need routing functions. I always load the code I am going to run in Primary and copy it to Secondary. This is because the switch boots from primary by default. When I do upgrades, I load the new image to Secondary and test. If all is good, I copy it to Primary.
Long answer to say it is not good to keep two different code types on a production switch as if for some reason it boots to the other partition, functionality will be lost and you will have an outage. Why take the risk?
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