General questions concerning RAC installation

Dear Oracle experts,
I would like to try an RAC installation using Oracle 10g on Solaris(Sparc).
I just want to go through the installation process without the intention to use
the RAC productively.
Is it possible to install the RAC database in a second ORACLE_HOME additionally to
an existing Oracle installation ?
Are there any traps to avoid ?
Do I really have to install the database software after installing the Cluster software or
is it possible to install the cluster software to upgrade an existing database installation ?
Is it possible to use the RAC without ASM ? (My second machine doesn't have a harddisk left..).
Thanks in advance for your advices.
Best regards,
Daniel

Hi Daniel,
You can't have only one instance of ASM running and sharing the disks. You need to have ASM installed on each RAC node in order to mount the shared disks.
Now you can use one single ASM instance on a server that could be shared by multiple databases (on that same server). We do this in one of our development environments.
You may not have to upgrade your hardware for a little RAC sandbox. The main thing is getting storage shared between the 2 servers and having the extra NICs for the private interconnect.
Alfredo

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