Comment 2 for bug 1242511

The current implementation of GPFS driver will check the GPFS mount path during driver initialization. However, when volume service is running, under some circumstances, the operator may also need to unmount GPFS without shutdown volume service. For instance, if the volume node is configured as a multi-backend node. When the operator need to unmount GPFS filesystem and perform some mantainence operation against NSD or something else, he would not hope to stop volume service, because the request to other backends still need to be handled. I feel it is better to have a way to let volume service temporarily refuse GPFS request. The current implementation will create file under a wrong place without any error notification. It will be hard for the operator to detect and recover this error.