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Configuration 5. Eight-Socket Storage Rich

The ThinkSystem SR950 is available in several configurations.

Full featured 6- or 8-socket server with up to 24 drive bays and the maximum number of PCIe x16 slots.

  • Requires 6 or 8 processors, must be 8100 Series

  • 24 drive bays, 12 of which support NVMe drives (8 NVMe with 6 processors)

  • 17 rear PCIe slots (13 rear slots with 6 processors installed)

  • Two compute trays each with two system boards

Processor configurations

This configuration supports 6 or 8 processors.
  • 6-processor configuration. Processors are installed in locations 1, 2, 3, 4, 5, and 7.

  • 8-processor configuration. Processors are installed in locations 1 through 8.

Figure 1. Processor numbering (viewed from the front of the server)
CPU and DIMM layout for multiple-processor systems

PCIe slot connectivity

The following table shows the processor to PCIe slot connectivity:
PCIe slotSlot locationDescription
1Riser 1








5I/O tray2
8 (ML2)1
9 (LOM)1 (PCH)
10Riser 27
15 (ML2)3
162x8 Riser3
M.2I/O tray1 (PCH)
Storage adapterUpper tray5
Storage adapterLower tray1
  1. In 6-processor configurations, processors 6 & 8 are not installed; this means slots 1-4 are not connected

Drive bays

Drives are all located at the front of the server, 12 drives at the front of the upper tray and 12 at the front of the lower tray. Drives are connected to 4-drive backplanes in a 2-by-2 configuration, as shown in the following figure. All drive bays are 2.5-inch form factor.

Two different drive backplanes are available for the server:
  • SAS/SATA backplane: Supports 4 SAS or SATA drives

  • AnyBay backplane:

    • Top two drives support SAS, SATA, or NVMe interface drives (Lenovo AnyBay). The server can support up to 12 NVMe drives, depending on the server configuration. The NVMe-capable drive bays are the even-numbered bays as shown in Figure 2.

    • Bottom two drive bays support SAS or SATA drives only

Regular 2.5-inch SAS/SATA drive bays support only SAS or SATA drives; however, the Lenovo AnyBay drive bay design allows a choice of SATA, SAS, or U.2 (NVMe) PCIe drives. This design enables the flexibility to configure some of the bays with high-performance PCIe SSDs while still using the other bays for high-capacity HDDs, which is an ideal solution for storage-tiering.

Figure 2. Drive bay locations

The following table lists the drive bays and NVMe support for the Four-Socket Performance configuration.
Installed processorsMaximum storageLocation of NVMe drives (see Figure 2)
624 drives (8 NVMe drives)Bays 0, 2, 4, 6, 8, 10 and 12, 14
824 drives (12 NVMe drives)Bays 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22