In general, to achieve safe, secure data storage access for shared read/write I/O operation while maintaining data...
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consistency requires some form of data sharing software. Software includes shared SAN file system from Quantum (formerly ADIC) and SGI among others, as well as distributed or networked file systems that support NFS and Microsoft Windows CIFS-based access. For example, most network attached storage (NAS) solutions from vendors, including BlueArc, EMC, HP, IBM, Network Appliance (NetApp), as well as other vendors' solutions based on Microsoft Windows Storage Server (WSS), would enable your Web servers to access data for concurrent shared read/write access while maintaining data consistency.
From an EMC-specific perspective, generally speaking you would be looking at a Celerra NAS appliance or Celerra NAS gateway type solution. However, consult with your solution providers to determine the exact make and model that would be best for you. Also consider alternatives, such as a server with either direct-attached SAS, iSCSI or Fibre Channel network attached storage running Microsoft WSS configured as a NFS and CIFS file server to complement your existing Windows-based Web servers.
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