We had a nasty problem when we added the ONLINE or zero downtime option to our RR backups. We had already been using the ONLINE option on another system without any problems. This is what the errors look like: /22:40/ RoadRunner ERROR 106: Unable to obtain online logging information for ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^ file /HMOCORP/BOBK/NJ3 /22:40/ MPE XL status: Subsystem 1000, error -38 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ After a few minutes the backup job hung and would not log off when aborted. We then had to reboot. Upon further investigation I noticed that these files had been compressed with CSM from Solution Soft. It appears that RR bypasses the AIF trap and accesses the files in a different way. I've also noticed that during patch installs (without running PENABLE which activates the AIF trap), that MPE reports a bad file label when attempting to access the file. The only conclusion I can come to is that there is a conflict between RR ONLINE and CSM. I will be gradually decompressing files and will try the ONLINE option again when completed. If ONLINE works without a problem at that point, I will consider that further evidence that my assumption is correct.