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Network Direct Attached Storage

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Network Direct Attached Storage (NDAS) is a proprietary NAS type system, patented by Ximeta, for connecting external digital storage devices such as hard-disks, flash memory and tape drives via ethernet networks. Of interest, unlike other, more common forms of networked storage such as SAN and NAS, NDAS devices do not use TCP/IP to communicate over the network. They credit this as enabling them to achieve higher through-put rates via the LPX Protocol. NDAS also supports RAID, aggregation and mirroring.

Issues

Drivers required to operate NDAS devices over a network are not currently shipped with operating systems. The devices are usually accompanied with client driver software for Windows operating systems, which is common.

  • Drivers for Linux based operating systems (e.g. Fedora, Ubuntu and Debian GNU/Linux) are available from the manufacturer in beta-phase for quite some time. The Linux connection package does have a shared read and write access mode, however it must be used with a multi-client file system. See Using NDAS with RedHat GFS and Sharing NDAS drives using OCFS2 from Oracle
  • Also, environments in which multiple machines wish to access the networked device or in a RAID configuration can result in data loss or corruption.
  • Starting with Mac OS X 10.6.7 (March 2011) the Ximeta drivers no longer works. A remedy has been promised in May 2011 but not yet implemented.


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