The logical log backup device is specified by the LTAPEDEV parameter in the database server parameter file. The parameter LTAPESIZE determines the size of the backup media.
The device is typically a tape drive, but it can be a directory. If you specify a directory, it is treated like a tape device.
The directory must exist and be writable by members of the Informix-Admin group.
The directory must exist and be writable by user informix.