I am running this tool MS Exchange troubleshooting tool(I am resetting the log generator number). Does anyone know how long this thing takes to run for the log file backup and renumbering??

When it finishes, you'll know.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

if you want quick resolution dismount the database check the health of the database if it is in clean shutdown, move the log files (E00.log, E00xxxxxxx.log,res1.log and res2.log) and check point file (E00.chk) to another location mount the database and u will see the log file generation from e0000001.log.Thanks Joseph Pradeep

Just starting to wonder its around hour 4 but the processor is still doing work. Must be doing something.

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the easiest way doing this task is dismounting all the databaes in the storage group then navigate to log folder directory rename the old logs folder to something like "SG4logs.old" then mount all databases. you can moved the old logs later this way you will avoid downtime while logs are beeing moved. NOw as you have already started the process with the assistant i would recomend you to wait. unless the process is not responding open the corrosponding process in taskmgr and see I/O if the bytes are constant.Dhruv