ko, let's start by explaining what VCSMM is and what it does. Then we
can guess what the error means.

VCSMM is used for cache-fusion between nodes in a RAC cluster. Thus
VCSMM provides the way that the RAC niodes in a cluster can communicate.

This means that Oracle uses ioctl (io control commands) to talk to VCSMM
(and thus to each other).

OK, so what is happening in your case ?

I would guess that at the same time every day, you run some cron job
that does parallel queries. The parallel queries might not be setup
correctly (causing Oracle to send invalid ioctls) or Oracle needs a
patch (to send the correct ioctls) or the Veritas VCSMM library (which
you should have linked in) is not the correct library (thus Oracle is a
64-bit but the library is 32-bit)

The specifics of the V-10-1-15012 error can be followed up with Veritas
support

Shawna wrote:
> Platform: Solaris 10, Oracle 10gR2 RAC 2 node cluster, Veritas 4.1MP1. Everyday
> at the same time, I get 3 entries for the following in the messages log:
>
> vcsmm [ID843321 kern.notice] VCS RAC ERROR V-10-1-15012 vcsmm_ioctl: unknown
> cmd
>
> What is the vcsmm_ioctl? What could be calling it that is bad?