IBM NeXtScale System Planning And Implementation Manual page 244

Figure 8-5 shows the GSS configurations.
x3650 M4 Server
JBOD
Disk Enclosure
GSS 24: Light and Fast
Figure 8-5 Base configurations and large configuration that are built on GSS
Base spinning-disk capacity is 464 TB - 1044 TB, plus six solid-state drives
for performance and system management.
Choice of FDR InfiniBand or Ethernet interconnects, or both.
Declustered RAID for sustained, predictable performance and rapid rebuilds.
Data and parity is distributed between several disks so it benefits
performance and reliability. In the case of a disk failure, all of the disks
participate in the reconstruction while the input and output demand is
serviced.
No hardware controllers. Disk management and RAID are performed by the
GPFS Native RAID feature.
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IBM NeXtScale System Planning and Implementation Guide
GSS 26: HPC Workhorse
2 3650 servers + 2 3650 servers +
4 JBOD 20U rack
6 JBOD Enclosures, 28U
10 Gbps
12 Gbps
High-Density HPC Option
6 3650 servers + 18 JBOD
2 - 42U Standard Racks
36 Gbps