Upgrading ESX 4.1 into ESXi 5.1u1 caveats Share on Facebook Post on reddit Tweet on Twitter Share on LinkedIn Home › Forums › Virtualization › VMware Virtualization › Upgrading ESX 4.1 into ESXi 5.1u1 caveats This topic has 10 replies, 4 voices, and was last updated 6 years, 11 months ago by albertwt. Viewing 1 post (of 1 total) Author Posts albertwtMember Sep 12, 2013 at 6:30 am #162346 Hi People, What should we pay attention into especially when we upgrade the existing ESX 4.1 into ESXi 5.1 Update 1 ? My understanding is that the previous COS on 8 GB VMDK will no longer be running or exist anymore when I selected the Force Migrate ESXi and preserve the VMFS partition ?:confused: Please share your experience in upgrading here. Cheers Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.