NDAS documents

In this page, we will add the documents of NDAS concept, NDAS APIs, any known problem, and so on that can help to develop and enhance the NDAS driver for the various OS and platform including Linux OS.

1. About NDAS

NDAS stands for Network Direct Attached Storage. XIMETA's patented disk storage technology.

Pros.

• Higher performance. (faster than tcp based protocols)
• Lower cost (no os, no cpu, no dram on storage side).
• Easier to use. (no ip setup)

Cons.

• You should install the device driver.

Performance.

• 11MB/s 100Mbps network
  • Other NAS servers in the market mark around 7.0MB/s - 8.8MB/s
• 55MB/s on Gigabit network (You need Giga NDAS product)
  • This is the same speed of the local hard disk (IDE).
  • We believe this limit is due to the Hard Disk not due to NDAS
  • Most of gigabit NAS servers in the market perform below 12MB/s. one vendor claims 15MB/s.

2. NDAS cross platform concept

We abstracted the NDAS core to port the driver over the platforms easily.

http://code.ximeta.com/trac-ndas/attachment/wiki/Document/xplat.png

• NDAS Block device driver - The raw block device of NetDisk that can host a file system.
• NDAS core - Library that can access the NDAS device.
• NDAS system abstracted layer(SAL) - Primitive APIs to implement the NDAS core .

3. See Also

• Porting the NDAS driver