Forward and backward compatibility of VMFS


I have a question regarding VMFS volume backwards compatibility, as probably many others there is not alot of free disk around.. I was wondering if anyone got a scheme of versions that are forward compatible, as an example. Should I add a new volume to either a esxi 4.1 host or esxi 5.0 host and then present this to an old 3.5 host to transfer som data, is this possible? I have used the forward compatibility with older vmfs version from 3.5 to 4.1, but never the other way around.

Any ideas?
Who is Participating?
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
oh yes, sorry I missed that.

ESXi5.0 allows you to create VMFS3 or VMFS5 datastores, when creating a new datastore.

Youve got no issues with 3.5 or 4.x.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
VMFS3 is compatible with ESX/ESXi 3.5 and ESX/ESXi 4.0.
VMFS5 is only compatible with ESXi 5.0

Yes it is possible, as long as you use VMFS3.
if you cannot you can copy the vm's by browsing to the datastore copy it locally and upload it to the other datastore by using viclient browse to datastore by clicking storage
synackrstAuthor Commented:
I guess VMFS3 is compatible with ESXi 5.0 aswell, atleast as far as I have read? Hopefully I have enough free disk space to empty a few volumes and format to VMFS5 when I am fully running 5.0 environment.

Planning on upgrading my ESXi 4.1 environment to 5.0 early next year, still got some old vm's with HW version 3 that I need to upgrade first and get rid of a few 3.5 hosts. Then I should be good to go.

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