From the VSS backup & restore document, it is said that currently Oracle VSS writer service does not support VSS for oracle database configure with ASM, RAW file system, OCFC, ACFS, NFS.
Also it does not support RAC with the above config.

Is there any way to know from the Oracle instance that VSS is not support if such configuration are set.
I mean is there any direct way for e.g. OCI api or sql query which tells whether vss is supported for that particular instance

If not than is there some workaround. May be we can get info about such configuration (eg ASM, RAW file system etc).