RMAN Backup of SPFILE Returns Error ORA-17507: I/O request size 512 is not a multiple of logical block size
Snapshot controlfile is configured with the same name as the spfile within ASM.
Reconfigure the snapshot controlfile so it has a unique name:
RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘+<diskgroup>/<db_unique_name>/snapcf_<db_name>.f’;
Any name which does not conflict with the spfile.