Table 1. Technical specifications (continued)
Specification
Description
Operating systems
Supported and certified operating systems: 
•  Microsoft Windows Server
•  Red Hat Enterprise Linux
•  SUSE Linux Enterprise Server
•  VMware ESXi
•  Canonical Ubuntu
Complete list of operating systems: 
https://lenovopress.com/osig
OS deployment instructions: See “Deploy the operating system” in Setup Guide
Internal drives
•  Front drive bays:
–  Up to 24 x 2.5-inch hot-swap SAS/SATA/NVMe drives
–  Up to 12 x 3.5-inch hot-swap SAS/SATA/NVMe drives
•  Middle drive bays: 
–  Up to 8 x 2.5-inch hot-swap SAS/SATA/NVMe drives
–  Up to 4 x 3.5-inch hot-swap SAS/SATA drives
•  Rear drive bays: 
–  Up to 8 x 2.5-inch hot-swap SAS/SATA drives
–  Up to 4 x 3.5-inch hot-swap SAS/SATA drives
–  Up to two 7mm drives
•  Up to two internal M.2 drives
For detailed about supported internal storage, see 
https://lenovopress.com/lp1392- 
thinksystem-sr650-v2-server#internal-storage
For thermal information about server models with middle or rear drive bays, see “Server 
models with middle/rear drive bays” on page 194.
Expansion slots
•  Up to eight PCIe slots
•  One OCP adapter slot
PCIe slot availability is based on riser selection and rear drive bay selection. See “Rear 
view” on page 44 and “PCIe slots and PCIe adapters” on page 189.
4 ThinkSystem SR650 V2Maintenance Manual