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Adding new host to cluster which is running on different build

I have a cluster with hosts version ESXi 5.5 Express Patch 5 that is older than the new host I have which is running ESXi 5.5 Update 3a, will there be any issues adding the new host to the cluster ? will there be issues when migrating machines over ?
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ExchangeKB
Asked:
ExchangeKB
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1 Solution
 
AndyIt ConsultantCommented:
As long as they are both 5.5 there should be no issues, assume your vCenter is 5.5 or 6?
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Richardson PortoSenior Infrastructure SpecialistCommented:
There is no problem, but it is always recommended try to keep all hosts at the same build number. Just avoid upgrade your host to ESXi Update 3b, cause if you want do that, you will need to upgrade your vCenter to version 5.5 Update 3b before upgrade the hosts.
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AndyIt ConsultantCommented:
It also depends on the Oracle/SQL versions, and CPU family if you're looking at vMotion etc.
If they're the same hardware then this is also much better.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I have a cluster with hosts version ESXi 5.5 Express Patch 5 that is older than the new host I have which is running ESXi 5.5 Update 3a, will there be any issues adding the new host to the cluster ? will there be issues when migrating machines over ?

No issues, but if CPU generations are different you may need to enable EVC mode, and to enable this may require a power down of hosts and Virtual Machines.

So what are the Host CPUs ?
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ExchangeKBAuthor Commented:
@Andrew The new host has 2 X Intel Xeons and the cluster is in EVC sandy bridge mode.
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AndyIt ConsultantCommented:
What about the old host?
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ExchangeKBAuthor Commented:
Old hosts are also Intel Xeon
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gheistCommented:
Intel Xeon Pentium III or some later architecture?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You should be fine, that the new server added will work in Sandy Bridge mode, if already in EVC mode.
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