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I'm installing my first RAC and I was wondering if I should install CRS (we are still at 10g for compatibility reasons) then patch to before I install ASM (then patch) and finally rdbms (then patch)

or if I should install CRS / ASM / RDBMS and then patch to in the same order.

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I would go "CRS / ASM / RDBMS and then patch to in the same order" just to be sure I follow the most typical way that others went before became available. But it's just me, your first proposition will work as well.

Both alternatives guarantee that at all times:

CRS version >= DB version
CRS version >= ASM version
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