37
Channels
Controller A
Host
CH0, CH1, CH2, CH3
Configuration Information
Controller
1
Host server
2
Data path connection
Simple end-to-end connections with fault-
tolerant pairs
With more disk drives over SAS expansion links, you can create more logical groups of
drives. These logical drives using more host channel IDs or LUN numbers.
If a server has multiple data paths to a Unified Storage System, a multi-path software is
necessary, e.g., the MPIO driver.
The two logical drives in the above drawing cannot leverage the full computer power of the
system. You may attach 1 or 2 more expansion enclosures to acquire more end-to-end
performance.
