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Are you trying to use AU 4MB for your OCR diskgroup? If you plan to use in your DATA diskgroup (which is much more common), you can set it on later diskgroup creation.
Have you look at this thread?
AU size criteria with Oracle 11gR2
Thank you for your reply and the link, was a good read.
What i'm trying to do is to get +DATA set to 4 mb AU size, but the config assistant does this for me , but is using default 1 mb.
We are using external redundancy (SAN) so we have no +OCR group. Or is it recommended to create a diskgroup just for the ASM stuff?
Using sql*plus works just fine to create diskgroups with ausize of my choice, however, the +DATA diskgroup is already created by the asmca that is being run during and cannot be dropped.
What I would like to do is to get the -ausize parameter during the asmca installation. However it doesn't seem to be any way to change it :(.
Well we are not running RAC in this case, only the ASM part.
However, I contacted MOS and ended up with bug 14009493 , ID 1517960.1 . So this is a 188.8.131.52 bug that ignores the au_size value specified via oui.
No fix yet and only workaround is to move all files from the +DATA diskgroup (or whatever you choose for default diskgroup during installation) to another diskgroup, drop the diskgroup and recreate via sqlplus then move the data back.