Rule number 1. ***NEVER*** upgrade a host to a major release and yes, 4.1 is a major release. You should ALWAYS rebuild the host from scratch. The host installation is throw away. Why take the remote chance that an upgrade leaves something behind.
1. export performance data if you want to keep historical performance
2. Build a new Virtual Center server -- must be 64bit windows
3. Make a new SQL Server database
4. Install new VC server
5. Bring all hosts into new VC (just add them and ignore the error that they are being managed by a different VC once the VC is empty stop the service)
6. Put host1 into maintenance mode (evacuate host)
7. Install 4.1 on host1
8. Rinse and repeat steps 6 and 7. You can easily vmotion between 4.0 and 4.1 hosts
I only use upgrade manager to maintain small patches. When VMware releases a new ISO, rebuild your hosts from that ISO. Building hosts is so simple, it makes almost no sense at all to put the environment at risk.
Arisap - Thank you. I should have updated this post when I got done.
My upgrade to Up 4.1 went well without issues bu using the Update manager. Maybe I took a risk.
mrdenny, out of curiosity, why would you even bother? Seems like a lot of work. I mean in theory it can be done. but if this is for production use, it seems like a risk that is unnecessary.
The upgrades were very simple to do. VMware has done a good job with building the upgrade process, there is no risk in using it.
If I wanted to install a new OS without upgrading I would had to have done to the CoLo and drop in a new CD (I suppose I could have made the DRAC cards mount an ISO) and then gone through the UI installer, then had to reconfigure all the networking on the host leading to a lot of possibility for fat fingering when setting all the networking back up.
These machines were production boxes with 12 nics that needed to be configured over 4 VLANs, not to mention the HBAs and the risk of having machines which are attached to the storage which aren't in the cluster. That's a lot of risk for problems compared to doing an upgrade that works.
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