Onbar backup using Tivoli Storage Manager

Hi guys, Is it possible to send logs backup of informix to disk using TSM? How can this task be achieved? I understand that ontape uses LTAPEDEV and whenever you use onbar and a storage manager to backup Informix, TAPEDEV and LTAPEDEV are ignored and all the mechanism control is being given to the storage manager. Using onbar with TSM, how does one configure Informix or TSM to send the logs to a location other than the storage device attached to the TSM server. Is this doable? >From past experience with other storage manager, I will define my pool, volume , device and type within the storage manager to take care of that piece, but recently I am told by someone from IBM that the same results can be obtained by configuring informix itself to direct the logs to another location. Is this a mixed up between onbar and ontape backups. Please advise! Ideas and thoughts are greatly appreciated. Regards, Josue P.