You may be running into problems with long directory names. To use long name space, you MUST have the data volume mounted BEFORE you load the database engine! With a clustered environment, this is often not the case, as the clustered volume can mount any time.
Verify your cluster scripts. When a server becomes the cluster host, it should be shutting down the database engine BEFORE mounting the volume, then mount the volume, and then restart the engine. This will look something like this:
MGRSTOP
BSTOP
MOUNT VOL1:
MGRSTART
Test the script first to make sure that the engine shuts down all the way. You may need a BTRV UNLINK command in there, still. (Haven't ever tried with v9.5.)