Not c0t0 but c0d0 and so on as these aren't SCSI disks.
The secondaries are likely to be c1d0 and c1d1.
However, unlike Linux, Solaris isn't (re)numbering its disks should new disks are installed in lower empty slots so for example, if you install Solaris on a machine where the only disk is the secondary master, it will be named c0t0 and not c1t0. At least this is my understanding.
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