Multi site - data collecting and processing machines

Hi all,

I am looking for a high-level-Design pattern(s) that meets

with the following challenges for a Middle-Tier:

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Environment characteristics:

3-tier: UI->Middle Tier->Data
The Data is collected, compresses and stored in a remote devices.

The Middle tier should collect and uncompress data all the time from N
remote devices. The decoding process creates loads on the CPU.

The Middle-Tier encapsulate the remote devices and acts like a device
from the UI point of view.

The Middle-Tier is participate in a multi site i.e. there are several
Middle-Tier server in the site.

The end devices as well as the Middle-Tier are bind together in an
hierarchy fashion.

Thanks in advance

Oren.

.