Re: Problems in Upgrade from ESX 4.00 To ESX 5.5 U2 on HP DL380 G6 .

the license is Essential Plus so vmotion is enabled but Can I  migrate vm running in Esx4  directly to ESX 5.5 withen the vcenter 5.5  ?

I mean A Host DVD Device . it doesn't have a dvd but should I disconnect the  device before upgrade

Regarding the second problem and your KB .

after checking the article

i checked the block size in the two hosts are the same 1MB and the type of the data store format VMFS3 .

if there is any other information that can help