BAR_XFER_BUF_SIZE was set to 15 and BAR_BSALIB_PATH was defined.
here is BAR_ACT_LOG output:
2006-01-31 08:08:37 2936 2936 d:\informix\bin\onbar_d -b -w -L 1
2006-01-31 08:08:39 2936 2936 Begin level 1 backup rootdbs.
2006-01-31 08:08:53 2936 2936 Successfully connected to Storage Manager.
2006-01-31 08:08:59 2936 2936 Completed level 1 backup rootdbs (Storage Manager copy ID: 57371 0).
2006-01-31 08:09:00 2936 2936 Begin level 1 backup logspace.
2006-01-31 08:09:03 2936 2936 Completed level 1 backup logspace (Storage Manager copy ID: 57372 0).
2006-01-31 08:09:03 2936 2936 Begin level 1 backup ol_hour.
2006-01-31 08:09:46 2936 2936 Completed level 1 backup ol_hour (Storage Manager copy ID: 57373 0).
2006-01-31 08:09:46 2936 2936 Begin level 1 backup sbspace.
2006-01-31 08:09:49 2936 2936 Completed level 1 backup sbspace (Storage Manager copy ID: 57374 0).
2006-01-31 08:09:50 2936 2936 Begin backup logical log 26491.
2006-01-31 08:10:03 2936 2936 Successfully connected to Storage Manager.
2006-01-31 08:10:07 2184 2184 d:\informix\bin\onbar_d -b -l
2006-01-31 08:10:07 2184 2184 A log backup is already running. Can't start another.
2006-01-31 08:10:08 2936 2936 Completed backup logical log 26491 (Storage Manager copy ID: 57375 0).
2006-01-31 08:10:09 2936 2936 d:\informix\bin\onbar_d complete, returning 0 (0x00)
2006-01-31 08:10:12 2184 2184 d:\informix\bin\onbar_d complete, returning 152 (0x98)
2006-01-31 08:17:34 828 828 d:\informix\bin\onbar_d -b -l
2006-01-31 08:17:34 828 828 Begin backup logical log 26492.