Upgrade from 3.5 to 5.5 VMware

Need to understand for limitations and prerequisites..if we go for upgrade form 3.5 to 5.5

with respect to ..

VC Upgrade
ESX Upgrade from 3.5 to 5.5
VMFS Upgrade dependency/limitation
Networking Upgrade/limitation
any major task/downtime required for few thing to be reconfigured  if removed in 5.5

what should be bets approach here.. we should go for new setup or if we can use existing one ?
now we have plan to use fresh n new SAN /servers..so any special requirement for that ? so all vms can be migrated accordingly ..?

 any networking change required for vms migrated from 3.5 to 5.5?
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patronAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Does your server support 5.5, most 3.5 servers were 32 bit only.

Much has changed since 3.5.

What is your server ?

I would migrate all your VMs, to a new 5.5 server using VMware Converter.
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patronAuthor Commented:
we have new server hardware 64 bit supported ?

and my old server was hs21-8853..is that supported for 5.5 ?

any limitation for san as well ?

why V2V is required ?

 and if yes..i believe its free to use..so have to use one by one for all vms?

 please advise best approach to be followed?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you host hardware is supported for 5.5 that's okay.

There is NO upgrade path from ESXi 3.5 to 5.5.

You will have to BACKUP the VMs on the server, and do a complete NEW INstallation of ESXi 5.5 from CDROM Media.

Methods for upgrading to ESXi 5.5 (2058352)
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patronAuthor Commented:
I already have new hardware  for 5.5 setup

Need to understand limitation/prerequisites  for VM before we move them to  new Esxi 5.5 host, as earlier there were fine on 3.5 host ?

Any change required except vm tool/h/w version upgrade ?

like with respect to VM nics/Network config/San config/other settings.

as my plan is - ll prepare new vc for 5.5,then  how can i move vms form vc i have for 3.5 to vc i ll create for 5.5

can we do Vmotion /SVmotion from 3.5 to 5.5 host if SAN is shared ?

 any other config required for migrataion?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No changes are required on the VM, installation of VMware Tools is optional, but recommended, and there is no requirement to change the hardware version, unless you want to take advantage of newer features.

You can Export and Import VMs, or use "VMware Converter".

You cannot use vMotion/Storage vMotion, because vCenter 5.5 is not compatible with ESX 3.5.
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patronAuthor Commented:
Thank you.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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