Lenovo Flex System x240 Instruction Manual page 24

Flex System Storage Expansion Node
The x240 supports the attachment of the Flex System Storage Expansion Node. The Flex System
Storage Expansion Node provides the ability to attach additional 12 hot-swap 2.5-inch HDDs or SSDs
locally to the attached compute node. The Storage Expansion Node provides storage capacity for
Network Attach Storage (NAS) workloads, providing flexible storage to match capacity, performance and
reliability needs.
Model 8737-HBx includes the Storage Expansion Node as standard as listed in Table 2. All other models
support the SEN as an option.
The following figure shows the Flex System Storage Expansion Node attached to a compute node.
Figure 6. Flex System Storage Expansion Node (right) attached to a compute node (left)
The ordering information for the Storage Expansion Node is shown in the following table.
Table 14. Ordering part number and feature code
Part number Feature code*
68Y8588 A3JF
The Storage Expansion Node has the following features:
Connects directly to supported compute nodes via a PCIe 3.0 interface to the compute node's

expansion connector (See Figure 3)
Support for 12 hot-swap 2.5-inch drive, accessible via a sliding tray

Support for 6 Gbps SAS and SATA drives, both HDDs and SSDs

Based on an LSI SAS2208 6 Gbps RAID on Chip (ROC) controller

Supports RAID 0, 1, 5, 10, and 50 as standard. JBOD also supported. Optional RAID 6 and 60 with a

Features on Demand upgrade.
Optional 512 MB or 1 GB cache with cache-to-flash super capacitor offload

Note: The use of the Storage Expansion Node requires that the x240 Compute Node have both
processors installed.
For more information, see the Product Guide on the Flex System Storage Expansion Node,
http://www.redbooks.ibm.com/abstracts/tips0914.html?Open
Flex System x240 Compute Node (E5-2600 v2)
Description
Flex System Storage Expansion Node
Maximum
supported
1
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