If you are deploying nexus 1000v in your VMware vSphere environment, you may usually hit to the point require to unload VEM, VSM or reconfigure. Today I found some tips just to share here. If you accidentally deleted your VSM which before you unload the VSM from the vCenter, you will either end up having orphan nexus 1000V show up in your vCenter. Even if you try to name the same as previous, it will prompt the error telling you that the previous extension key and your current extension are mismatch.
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It been quite some times I did not migrate the ESX host from 1 vCenter to another. For most of the deployment recently, we were either deploy our vSphere 4 with DVswitch or Nexus 1000V from Cisco. Here are some steps you may want to consider when you migrate the ESX host from 1 vCenter to another if you are using DVswitch. Usually we can disconnect the ESX host from vCenter and remove it from inventory, and reconnect to the new vCenter. If you are follow this way for standard vSwitch, it shouldn’t cause you any problem, but if you deploy this way for the environment which using DVswitch, the new vCenter will give you error which shown the previous DVswitch record are still tie to the ESX host on a different vCenter. Do not get panic as the Network connectivity are still working as usual, but you will not able to connect the ESX host to the new DVSwitch.
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Today, 10 G Ethernet consider as common technology at least to the enterprise customer. Many of us are looking into 10G Ethernet from server to switch via L2 or L3 networking perspective. The main reason behind this are due to the Virtualization and Cloud Computing technology driven. Few years ago when we came out the design with multiple gigabits NICs on the ESX host to support NIC teaming, load balancing and etc, which may end up deliver around 14 Gbps of network bandwidth and 8Gbps of FC bandwidth per host. Each ESX host are consolidate 20 to 30 virtual machines. At that time, this may be the best option we could had done due to technology limitation. Is this design GOOD enough? I will say yes for previously, and NO for today technology availability.
Photo shot of the real environment which have 14 gigabits NIC Ports and 4 x 2 Gbps FC.
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Yesterday I just did a migration of vCenter server from Physical to virtual. I re-install and configured the vCenter on the virtual machine and manually registered all the ESX host to the new vCenter. 1 of the challenges I faced was the DVswitch. I had created the same DVswitch name and port group in the new vCenter. Guess what, during the migration, the virtual machines network disconnected. I tried to dig around whats went wrong, as I found there was case senstive on the dvswitch. The case senstivie applied and happened on the Hypervisor level but from the vCenter perspective, it may not be the case as Windows does not has the issue with case sensitive. I try to create a new DVswitch port group with the correct case sentitive as I did on the hypervisor previously, vCenter detected as duplicate portgroup name.
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