[smartmontools-support] How to read NVME results

[Thane K. Sherrington]

Hi all,
     Just wondering how I read the following results:

Specifically these lines:
Unsafe Shutdowns:                   102
Media and Data Integrity Errors:    0
Error Information Log Entries:      80
Warning  Comp. Temperature Time:    63
Critical Comp. Temperature Time:    0
Temperature Sensor 1:               59 Celsius

I'm assuming "Unsafe Shutdowns" aren't a failure in and of themselves, 
but cause stress to the drive (hence, unsafe) is that right?
Are "Media and Data Integrity" errors a bad failure (I don't have any on 
this drive, but for future reference)?  They sound bad.
Are 80 "Error Information Log Entries" bad - is there a way to see these 
log entries?  Should I consider this the beginnings of problems?
Is "Warning  Comp. Temperature Time" the number of minutes the drive has 
reached a warning temperature?  What is the warning temperature?
Is "Critical Comp. Temperature Time" the number of minutes the drive has 
reached critical temperature?  What is critical temp?
I see the drive is 59 Celsius - on mechanical drives, I always 
considered 40C to be hot, and 50C to be overheating.  What are the 
numbers for NVME SSDs?


The full log is below.


smartctl 7.2 2020-12-30 r5155 [i686-w64-mingw32-w10-1607(64)] (sf-7.2-1)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Number:                       KBG40ZNV256G KIOXIA
Serial Number:                      X1MPHG45QW82
Firmware Version:                   HP00AE00
PCI Vendor/Subsystem ID:            0x1e0f
IEEE OUI Identifier:                0x8ce38e
Total NVM Capacity:                 256,060,514,304 [256 GB]
Unallocated NVM Capacity:           0
Controller ID:                      0
NVMe Version:                       1.3
Number of Namespaces:               1
Namespace 1 Size/Capacity:          256,060,514,304 [256 GB]
Namespace 1 Formatted LBA Size:     512
Namespace 1 IEEE EUI-64:            8ce38e 0402f79283
Local Time is:                      Thu Apr 28 11:57:27 2022 ADT
Firmware Updates (0x14):            2 Slots, no Reset required
Optional Admin Commands (0x001f):   Security Format Frmw_DL NS_Mngmt 
Self_Test
Optional NVM Commands (0x005f):     Comp Wr_Unc DS_Mngmt Wr_Zero 
Sav/Sel_Feat Timestmp
Log Page Attributes (0x0e):         Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg
Maximum Data Transfer Size:         512 Pages
Warning  Comp. Temp. Threshold:     79 Celsius
Critical Comp. Temp. Threshold:     84 Celsius

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
  0 +     3.60W       -        -    0  0  0  0        1       1
  1 +     2.60W       -        -    1  1  1  1        1       1
  2 +     1.80W       -        -    2  2  2  2        1       1
  3 -   0.0500W       -        -    4  4  4  4      800    1200
  4 -   0.0050W       -        -    4  4  4  4     3000   32000

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
  0 +     512       0         3
  1 -    4096       0         1

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

SMART/Health Information (NVMe Log 0x02)
Critical Warning:                   0x00
Temperature:                        59 Celsius
Available Spare:                    100%
Available Spare Threshold:          5%
Percentage Used:                    0%
Data Units Read:                    1,242,650 [636 GB]
Data Units Written:                 2,947,714 [1.50 TB]
Host Read Commands:                 19,046,587
Host Write Commands:                30,101,722
Controller Busy Time:               97
Power Cycles:                       333
Power On Hours:                     77
Unsafe Shutdowns:                   102
Media and Data Integrity Errors:    0
Error Information Log Entries:      80
Warning  Comp. Temperature Time:    63
Critical Comp. Temperature Time:    0
Temperature Sensor 1:               59 Celsius

Error Information (NVMe Log 0x01, 16 of 256 entries)
No Errors Logged


-- 
Thane K. Sherrington

Computer Connection, Ltd. ...taking the mystery out of computers since 1982.
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thane at computerconnectionltd.com
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