Log on to Blackberry Administration service
Under services and components
Expand BlackBerry Solution topology > BlackBerry Domain > Component view > Logging
Click on the logfile name
While on the instance information tab, click edit instance at the bottom of the page.
Find the Log file path field
edit the field to the new logfile location and then click Save all at the bottom of the page.
After saving the change, the Blackberry services need to be restarted in the order below.
all other Blackberry services in any order
Mail may be delayed for 20 minutes when you restart the services.