Page Comparison

...

1. To identify which of the server's NVMe disk bays is bound to which of the CPUs, use the hardware manufacture documentation.
   Also, write down the disk's serial number by visually observing the disk.
   
   

2. In order to identify the disk OS path (e.g.: /dev/nvme01n),  disk serial and disk NUMA node use the following command :
   
   

   1. Identify all NVMe Disks installed on the server

      Code Block
      theme RDark
      lspci -nn | grep NVMNon-Volatile expected output : 5d:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54] 5e:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54] ad:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54] ae:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54] c5:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54] c6:00.0 Non-Volatile memory controller [0108]: Intel Corporation Express Flash NVMe P4500 [8086:0a54]

      
      

   2. Locate disk's NUMA node
      Use the disk PCI slot  listed in previous command  to identify the NUMA node (the first disk PCI slot is :  5d:00.0 )

      Code Block
      theme RDark linenumbers true
      lspci -s 5d:00.0 -v expected output : 5d:00.0 Non-Volatile memory controller: Intel Corporation Express Flash NVMe P4500 (prog-if 02 [NVM Express]) Subsystem: Lenovo Device 4712 Physical Slot: 70 Flags: bus master, fast devsel, latency 0, IRQ 93, NUMA node 1 Memory at e1310000 (64-bit, non-prefetchable) [size=16K] Expansion ROM at e1300000 [disabled] [size=64K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI-X: Enable+ Count=129 Masked- Capabilities: [60] Express Endpoint, MSI 00 Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [100] Advanced Error Reporting Capabilities: [150] Virtual Channel Capabilities: [180] Power Budgeting <?> Capabilities: [190] Alternative Routing-ID Interpretation (ARI) Capabilities: [270] Device Serial Number 55-cd-2e-41-4f-89-0f-43 Capabilities: [2a0] #19 Capabilities: [2d0] Latency Tolerance Reporting Capabilities: [310] L1 PM Substates Kernel driver in use: nvme Kernel modules: nvme

      From the command output (line number 8) we can identify the NUMA node ( Flags: bus master, fast devsel, latency 0, IRQ 93, NUMA node 1 )
      
      

   3. Identify NVMe Disks path
      Use the disk PCI slot  listed in previous command  to identify the disk's block device path

      Code Block
      theme RDark
      ls -la /sys/dev/block |grep 5d:00.0 expected output : lrwxrwxrwx. 1 root root 0 Nov 5 08:06 259:4 -> ../../devices/pci0000:58/0000:58:00.0/0000:59:00.0/0000:5a:02.0/0000:5d:00.0/nvme/nvme0/nvme0n1

      
      Use the last part of the device path (nvme0n1) as input for the following command :

      Code Block
      theme RDark
      nvme -list |grep nvme0n1 expected output : /dev/nvme0n1 PHLE822101AN3P2EGN SSDPE2KE032T7L 1 3.20 TB / 3.20 TB 512 B + 0 B QDV1LV45

      
      The disk's path is  /dev/nvme0n1

...