Infortrend DS 3024UB - Expansion Connections

2-37EonStor DS 3000 Series Hardware Manual
2.3.6 Expansion connections
A SAS host link is bundled per expansion package. If you need to purchase other cables, or if you need
other cables of different lengths, contact your vendor.
Before conguring the expansions, you must take note of the following important points:
• For a cleaner and clutter-free rack system, have a carefully planned routing paths when connecting
between systems.
• All SAS cables are sensitive and must be handled with care. DO NOT bend or twist the cables
when connecting the systems installed to the rack.
Conguring the SAS expansion
The SAS expansion port connects to expansion systems. For dual-controller systems, each expansion
port connects to a controller of another expansion system, making fault-tolerant links to different SAS
domains.
The following principles apply to SAN storage and expansion system connections:
• Dual-controller SAN storage connects to a single-controller expansion system
• Single-controller SAN storage connects to a single-controller expansion system
• A longer cable is available in making expansion links with a dual-controller conguration. If you
need to connect expansion systems from two opposite directions, you may need a longer cable.
Routing between two different connections can avoid loss of data links if one expansion fails to
operate.
Setting the expansion IDs
Each expansion system must have a unique ID and you can congure the ID via the rotary ID switch. To
set the expansion IDs, use a small at-blade screwdriver.
You must take note of the following when setting the IDs on the expansion system:
• Set the IDs from 1 to 15. The order starts from the expansion
that is closest to the managing DS enclosure.
• Ensure to set a unique ID on each enclosure so that the SAS
WWN addresses of the disk drives are properly assigned. The
SAN storage system rmware automatically manages these
addresses.