Check NVMe PCIe lanes

root@server5:~# lspci -vv |grep -e x4 -e x2 -e 'NVM Express'

01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller S4LV008[Pascal] (prog-if 02 [NVM Express])
                LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 8GT/s (downgraded), Width x2 (downgraded)

02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller S4LV008[Pascal] (prog-if 02 [NVM Express])
                LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 8GT/s (downgraded), Width x2 (downgraded)

07:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller S4LV008[Pascal] (prog-if 02 [NVM Express])
                LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 8GT/s (downgraded), Width x2 (downgraded)

08:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller S4LV008[Pascal] (prog-if 02 [NVM Express])
                LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 8GT/s (downgraded), Width x2 (downgraded)

root@server5:~# smartctl -a /dev/nvme0
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.14.0-15-generic] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Number:                       Samsung SSD 990 PRO with Heatsink 4TB
Serial Number:                      S7DSNJ0X904565Y
Firmware Version:                   4B2QJXD7
PCI Vendor/Subsystem ID:            0x144d
IEEE OUI Identifier:                0x002538
Total NVM Capacity:                 4,000,787,030,016 [4.00 TB]
Unallocated NVM Capacity:           0
Controller ID:                      1
NVMe Version:                       2.0
Number of Namespaces:               1
Namespace 1 Size/Capacity:          4,000,787,030,016 [4.00 TB]
Namespace 1 Utilization:            2,231,313,952,768 [2.23 TB]
Namespace 1 Formatted LBA Size:     512
Namespace 1 IEEE EUI-64:            002538 4941405891
Local Time is:                      Fri May  2 15:20:31 2025 EEST
Firmware Updates (0x16):            3 Slots, no Reset required
Optional Admin Commands (0x0017):   Security Format Frmw_DL Self_Test
Optional NVM Commands (0x0055):     Comp DS_Mngmt Sav/Sel_Feat Timestmp
Log Page Attributes (0x2f):         S/H_per_NS Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg Log0_FISE_MI
Maximum Data Transfer Size:         512 Pages
Warning  Comp. Temp. Threshold:     82 Celsius
Critical Comp. Temp. Threshold:     85 Celsius

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     9.39W       -        -    0  0  0  0        0       0
 1 +     9.39W       -        -    1  1  1  1        0       0
 2 +     9.39W       -        -    2  2  2  2        0       0
 3 -   0.0400W       -        -    3  3  3  3     4200    2700
 4 -   0.0050W       -        -    4  4  4  4      500   21800

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
 0 +     512       0         0

=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

SMART/Health Information (NVMe Log 0x02)
Critical Warning:                   0x00
Temperature:                        32 Celsius
Available Spare:                    100%
Available Spare Threshold:          10%
Percentage Used:                    0%
Data Units Read:                    36,569,142 [18.7 TB]
Data Units Written:                 16,804,966 [8.60 TB]
Host Read Commands:                 1,541,344,522
Host Write Commands:                227,849,482
Controller Busy Time:               1,615
Power Cycles:                       1,118
Power On Hours:                     383
Unsafe Shutdowns:                   980
Media and Data Integrity Errors:    0
Error Information Log Entries:      0
Warning  Comp. Temperature Time:    1
Critical Comp. Temperature Time:    0
Temperature Sensor 1:               32 Celsius
Temperature Sensor 2:               35 Celsius

Error Information (NVMe Log 0x01, 16 of 64 entries)
No Errors Logged

Self-test Log (NVMe Log 0x06)
Self-test status: No self-test in progress
Num  Test_Description  Status                       Power_on_Hours  Failing_LBA  NSID Seg SCT Code
 0   Short             Completed without error                 207            -     -   -   -    -
 1   Extended          Completed without error                  56            -     -   -   -    -
 2   Short             Completed without error                   1            -     -   -   -    -