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20 About Your System
• Expansion mode (four zones)
In expansion mode with four zones configuration, the storage sled SAS
expander board supports 24 x 2.5 SSD hard-drives from a single-cable
connection. The SAS connections are grouped into four zones (A1/Zone 0,
A2/Zone 1, B1/Zone 2, B2/Zone 3) and each zone allows the host/compute
sled to access a group of hard-drives in the storage sled.
The figure below shows four single-RAID compute sleds connected to the
storage sled’s four external mini-SAS connectors. Each compute sled can
only access the hard-drives in the assigned zone.
Figure 1-13. Expansion Mode (Four Zones)
Figure 1-14. Zoning Table
Single-RAID Compute SledsStorage Sled
Compute
Sled 1
Compute
Sled 2
Compute
Sled 3
Compute
Sled 4