In Production environment, we having SuSE 10 SP 2,
Sever count is 10
Application: SAP

We are interesting in upgrading this SuSE 10 SP 2 to SuSE 11 SP2

What would be the best possible method to achieve this task?

Do we needs to apply patches sequentially
i.e: SuSE 10 SP3 -> SuSE 10 SP4 ->SuSE 11 SP1 -> SuSE 11 SP2


else is it possible to use the upgrade option in SuSE 11 SP2 DVD and perform installation at one go?

What about the down time in both the options?