The choice of a clustered file system?

If you need a normal storage solution (and not hardware), it GPFS you are unlikely to find. The same fixture does not contain a (IMHO) means to achieve data redundancy on different nodes, and the failure of a node means data loss. License for GPFS which is cheap, well and to kernel is a kernel module that is dynamically loaded. You put the driver for iron than you this way GPFS is not pleased?
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For customers who can't keep GPFS native on multiple nodes, you can distribute NFS