Help me about backup Logical log with On-BAR...

[garrdb]

when I try 'onbar -b rootdbs', the database space can be backed up completely but only logs cannot. The exact message is list below

2003-12-23 12:43:27 848 847 /usr/informix/bin/onbar_d -b rootdbs
2003-12-23 12:43:30 848 847 Begin level 0 backup rootdbs.
2003-12-23 12:43:30 848 847 Successfully connected to Storage Manager.
2003-12-23 12:44:00 848 847 Completed level 0 backup rootdbs
2003-12-23 12:44:06 848 847 Begin backup logical log 218053.
2003-12-23 12:44:07 848 847 Successfully connected to Storage Manager.
2003-12-23 12:44:44 848 847 SQL -25587 Network receive failed.
2003-12-23 12:44:45 848 847 ERROR: One or more BLOBspaces are down. Log backup has been aborted.

And one error message showed up
shmat (13) : Operating System Error

I think from this log, the connection to database server is OK because it can backup rootdbs.

Do I have to check another configuration to successful log backup?

thank you.