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1. Is it OK to set the same place to audit_file_dest on each instance?yes
2. In case different directory is set to each instance, when I access to instance#1, will audit logs output in audit_file_dest of instance#1 only?yes, this parameter is set when you're going to set auditing to OS ,if you choose DB then it will write the auditing record to aud$ table.
however sys log still be generated in audit_file_dest.
AUDIT_FILE_DEST specifies the operating system directory into which the audit trail is written when the AUDIT_TRAIL initialization parameter is set to os. It is also the location to which mandatory auditing information is written and, if so specified by the AUDIT_SYS_OPERATIONS initialization parameter, audit records for user SYS.