Multiple nginx instances share same proxy cache storage

[badtzhou]

I am thinking about setting up multiple nginx instances share single proxy
cache storage using NAS, NFS or some kind of distributed file system. Cache
key will be the same for all nginx instances.
Will this theory work? What kind of problem will it cause(locking, cached
corruption or missing metadata in the memory)?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,252275,252275#msg-252275