main_loop stuck !

Hello everyone, has anyone out there had this problem ??? Using: Online 7.13.UC2 on: Solaris 2.5 The situation is as follows: Logical log files are almost full - backup is needed. (Before you all start chastising me, there are valid(ish) reasons for this !) I have LBU_PRESERVE set to 1, so I have 1 free log left. I initiate a log backup with ontape -a and the logs backup nicely. So, my system is now ready to thunder on. 2 minutes later a checkpoint starts, and takes a bit longer than expected. After a couple of minutes, I look and see that onstat -g wai shows that main_loop is waiting on cond wait ( log). But my physical log is empty and all my logical logs files show U-B (ie, backed up). This, unfortunately means my system is locked up forever, as the cond wait is never released. So: 1) What is it waiting for ? 2) Can anyone shed any light on this ? 3) Has anyone experienced anything similar themselves ? Cheers for any help, Message issued by Online: -- Rick Ward Senior DBA Great Universal Stores Home Shopping MANCHESTER, UK