At this time, labstore2001 is supposed to be ready to take over the labstore role with a simple switchover. This has not been tested, however, and needs a maintenance window to test.
If all goes well, downtime should be measured in seconds. Failure will require rebooting and restarting NFS service on labstore1001, taking at least 5 minutes. We should plan for a 3 hour window in case of catastrophe.