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Vmware Upgrade queries...

Need to confirm few things on upgrade to be done from 4.1 to 5.5

Is it require to enabled EVC if all my Esxi host upgraded from 4.1 to 5.5 in new vc and in new cluster.and all are with same model,type and CPU generation.  any  method to check and confirm if evc to be enabled on cluster having such host ?

Upgraded my host from 4.1 to 5.5   Now to upgrade dvSwitch from 4.1.0 to 5.5.0 -any downtime required ?

Can we do roll-back if there is any issue during dvswicth upgrade ?

any limitation/restriction with VMFS upgrade from vmfs 3 [4.1]to vmfs5 [5.5] ?

Can we do vmfs upgrade with no downtime or if any restriction due to some ATS settings disabled due to san dependency
URL for reference :
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2113956
VMwareStorageNetworking

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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

8/22/2022 - Mon
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Thanks Andrew ,Block Size,what i can understand..

we should always create new vmfs 5 ?

else if we upgrade existing vmfs 3 to 5,it will be as same as it was earlier, untill we extend size from 2 TB ?
 and for EVC ,i can see same h/w model and type i have. will check for generation if possible through esx host command line and will move vms to other hots in cluster?
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and there is no ATS limitation  during vmfs upgrade as given in above url ?

 for dvswitch upgrade from 4.1 to 5.1 -downtime required ? and can we take any pre backup in case roll back is required ?
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

If this is ESXi you can backup the configuration.
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fblack61
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yes it is esxi 5.5
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Thanks  its fine with esxi config backup,but here i need info about dv switch upgrade from 4.1 to 5.1
 will there be any outage if I upgrade  it in live environment or if  any downtime to be planned?
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Thanks
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Thanks
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

no problems.