Upgrading RAC to 10.2.0.5 with minimum down time

 All,

I am upgrading my 2 node RAC database from 10.2.0.4 to10.2.0.5.  When I was upgrading in lower environment, I Need to move my database from one node to other node 2 times.

I just wanted to know, is there any way I can do this with single down time?

I have CRS,ASM and DB home seperate on each node, here are the sequences I followed

1) Node1 Shuttdown everything (DB/ASM/CRS)

2) Upgrade CRS to 10.2.0.5

Now I wanted to upgrade ASM/DB on Node1 but that is not allowed and it forced me to upgrade the CRS home on NODE2

So I need to shutdown everything on NODE2 and start on NODE1