There is nothing like primary and secondary VTP server and neither you can cofnigure the same as you do for STP.
Ofcourse you can have more than 2 VTP servers in your network and all should have the same config revision number, incase one VTP server goes down the other VTP server will be there to take care of your VTP clients.
in addition to Ankur´s post, I think the general guideline is to configure the VTP server as the root for your VLANs as well. So if you have two VTP servers, you could configure one as the root for one half of your VLANs, and as the secondary root for the other half, and do the same on the other VTP server switch. That way, you would use your server switches in a sort of redundant fashion...
My preference these days is for VTP transparent mode in all switches. Not only is it safer but allows the use of higher number VLANs (above 1005) up to 4096. In mode cases all VLANs do not need to be known by all switches. The ease of use for Server/Client modes does not out weigh the security and flexiblity of Tranparent mode.
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