Intel's IOP platform is no longer supported in Debian.
Here is a list of known issues and bugs with Debian on the Thecus N2100.
Debian 7 (wheezy) with 3.2 kernel
- Disk access is slow because of lack of support for the DMA engine on the IOP32x chip.
Debian 8 (jessie)
- The IOP32x platform is no longer supported. This means that support for the Thecus N2100 was dropped.