Error 240???

Informix ISQL 4.11.UC1 Informix SE SCO Unix (sorry, don't know what release) database has logfile /dblog/prod_acct_db.log device has 105,000 pages free (i.e. PLENTY o' room) I try the following: DELETE FROM foo WHERE status_code = <some constant. e.g. 'S','V', etc.>; I get... 240: Could not delete a row. 121: ISAM Error: Cannot write log record. Number of records to be deleted ranges from just over 100 to 78,000. I've tried linking /dev/null to the logfile to prevent ANY disk access problems. No difference. I AM able to perform the deletes if I break it down into groups of 50. Basically, I unload the ROWID's into a table and then create "delete from foo where rowid in (..." so that the deletes occur in groups of 50 or 60. Am I missing something? Is there a "long transaction" situation in SE like there is in Online? Is there a way to set the value to permit higher number of transactions? This only appears to happen in DELETE's. I can successfully dbload and commit in groups as high as 1000. Any suggestions would be appreciated. Thanks in advance.