Comment 1 for bug 1246779

I open this bug, because I hope to discuss what capacity number should we return if one GPFS volume node is unmounted. Personally, I do not prefer to let Cinder code to re-mount GPFS, because admin may need to unmount the filesystem temporarily to perform mantainence task. And if this volume node is a multi-backend node, he may not hope to shutdown cinder volume service. If we have several GPFS volume service running on different hosts, maybe we can let get_volume_stats() to report zero capacity, so that Cinder will schedule the volume request to another GPFS volume node. After GPFS is mounted again, the correct capacity number will be reported.