One way to do it without a clustered file system is to provide single writer access (on one server) to the LUN...
via the SAN, and then create a network share on that server for multiple read access by the other servers over the LAN.
Some clustering products include: Veritas VCS, Microsoft MSCS, SunCluster, TruCluster and VMS Cluster.
Some GFS solutions include: SAMFs/Qfs, Sistina, Panasas, IBRIX, SGI IRIX, Lustre, IBM TotalStorage and SANfs.
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