How to get smart attributes in different protocol disk

[jackeichen]

What is S.M.A.R.T.

S.M.A.R.T. (Self-Monitoring, Analysis, and Reporting Technology) is a monitoring system built into most drives. Its primary purpose is to detect and warn of signs of a failing drive automatically.

What can you benifit from SMART

SMART was invented because computers needed something that could monitor the health state of their hard drives. That means, plainly speaking, that SMART should supposedly be able to tell you if your hard drive or solid-state drive is about to stop working!

How does SMART do that?

You might be tempted to think that SMART can magically guess if your drive is healthy. What it does is an entirely different story, though. SMART keeps track of a series of variables whose number and type vary from drive to drive, which are indicators of its reliability.

SMART in different protocol

SMART is different in SATA,SAS,NVMe Disk.

• For SATA, SMART is vendor specific. Althrough some important attributes is universal in different vendors, some of the S.M.A.R.T. data is undocumented, that you need make it clear with the specific disk‘s guide.
• For NVMe, there is a common definition in log page ID 0x02 of NVMe Spec.
• For SAS, usually there is no SMART Data in one log page, you need get different attributes in different log page.

[jackeichen]

An example to get smart from SATA Disk(X is the SATA device path, like /dev/sda):

# pysata smart /dev/sda
issuing smart command
Device: /dev/sda


status err_bit of Smart Read Data: 0
status err_bit of Smart Threshold: 0

General SMART Values:
====================================================================================================
                     smartRevision: 1          [0x1]
                     offlineStatus: 2          [0x2]
                    selfTestStatus: 0          [0x0]
    offlineDataCollectionTimeInSec: 2          [0x2]
                        smartFlags: 0          [0x0]
 offlineDataCollectionCapabilities: 121        [0x79]
                  smart capability: 3          [0x3]
          Error logging capability: 1          [0x1]
                   VendorSpecific1: 0          [0x0]
     ShortSelftestPollingTimeInMin: 1          [0x1]
      longSelftestPollingTimeInMin: 2          [0x2]
      convSelftestPollingtimeInMin: 2          [0x2]
       extSelftestPollingTimeInMin: 0          [0x0]
                       reserved[9]: 0          [0x0]
              normalizedEraseCount: 0          [0x0]
       worstValueForRawRdErrorRate: 0          [0x0]
            BadBlocksBufferUpdated: 0          [0x0]
            nandChanBistTestResult: 0          [0x0]
                        selfTestBB: 0          [0x0]
                     factoryTestBB: 0          [0x0]
                         reserved1: 0          [0x0]
                  factoryBadBlocks: 0          [0x0]
                    grownBadBlocks: 0          [0x0]
                  pendingBadBlocks: 0          [0x0]
               totalHardwareResets: 0          [0x0]
                 eccOverLimitCount: 0          [0x0]
                       nvWrAuCount: 0          [0x0]
               programFailureCount: 0          [0x0]
                 eraseFailureCount: 0          [0x0]
               hostReadSectorCount: 0          [0x0]
                     nvRdCountSave: 0          [0x0]
                    numSpareBlocks: 0          [0x0]
                      sparePercent: 0          [0x0]
                          writeAmp: 0          [0x0]
                       reserved468: 0          [0x0]
                   autoSaveTimerID: 0          [0x0]
                         pOfflineQ: 0          [0x0]
                     erase2WrRatio: 0          [0x0]
                       reserved484: 0          [0x0]
                     hostUEccCount: 0          [0x0]
              lastUncorrectablePaa: 0          [0x0]
              lastUncorrectablePOS: 0          [0x0]
                         auPerPage: 0          [0x0]
                          numOfDie: 0          [0x0]
                vendorSpecific4[5]: 0          [0x0]
                          checkSum: 55         [0x37]

Vendor Specific SMART Attributes with Thresholds:
====================================================================================================
ID# ATTRIBUTE_NAME            FLAG   VALUE  WORST  THRESHOLD  RAW_VALUE
----------------------------------------------------------------------------------------------------
  5 Reallocated_Sector_Ct     0x32   74     74     0          0
  9 Power_On_Hours            0x32   100    100    0          8084
 12 Power_Cycle_Count         0x32   100    100    0          771
170 Unknown_Attribute         0x33   100    100    10         0
171 Unknown_Attribute         0x32   100    100    0          0
172 Unknown_Attribute         0x32   100    100    0          0
174 Unknown_Attribute         0x32   100    100    0          344
175 Program_Fail_Count_Chip   0x33   100    100    10         3332894558603
183 Runtime_Bad_Block         0x32   100    100    0          0
184 End-to-End_Error          0x33   100    100    90         0
187 Reported_Uncorrect        0x32   100    100    0          0
190 Airflow_Temperature_Cel   0x22   66     66     0          589365282
192 Power-Off_Retract_Count   0x32   100    100    0          344
194 Temperature_Celsius       0x22   100    100    0          34
197 Current_Pending_Sector    0x12   100    100    0          0
199 UDMA_CRC_Error_Count      0x3e   100    100    0          0
225 Load_Cycle_Count          0x32   100    100    0          12151
226 Load-in_Time              0x32   100    100    0          102
227 Torq-amp_Count            0x32   100    100    0          76
228 Power-off_Retract_Count   0x32   100    100    0          483640
229 Unknown_Attribute         0x32   100    100    0          0
230 Head_Amplitude            0x32   100    100    0          0
232 Available_Reservd_Space   0x33   100    100    10         0
233 Media_Wearout_Indicator   0x32   100    100    0          0
234 Unknown_Attribute         0x32   100    100    0          0
235 Unknown_Attribute         0x33   100    100    10         3332894558603
241 Total_LBAs_Written        0x32   100    100    0          12151
242 Total_LBAs_Read           0x32   100    100    0          41929
243 Unknown_Attribute         0x32   100    100    0          69665
246 Unknown_Attribute         0x32   100    100    0          1

[jackeichen]

For SAS Disk, attributes in different Log Page:

Page/Subpage Code	Description	Parameter Code	Parameter Value range
0x00/0x00	Supported Log Pages	NA	NA
0x0D/0x00	Temperature	0	1
0x0E/0x00	Power Cycle Count	4	0-3
0x11/0x00	Percentage Used	1	3
0x15/0x00	Power On Time	0	0-3

1. First to get support log page

# pyscsi log-sense /dev/sdb -p 0
issuing log sense command
/dev/sdb:

Log Page Name : Supported Log Pages
page_code     : 0
subpage_code  : 0
spf           : 0
ds            : 0
page_length   : 17
Log Parameters:

Supported log pages  [0x0]:
  0x0             : Supported Log Pages
  0x2             : Write Error Counter
  0x3             : Read Error Counter
  0x5             : Verify Error Counter
  0x6             : Non-Medium Error
  0xd             : Temperature
  0xe             : Start-Stop Cycle Counter
  0xf             : Application Client
  0x10            : Self-Test Results
  0x11            : Solid State Media
  0x15            : Background Scan
  0x18            : Protocol Specific Port
  0x1a            : Power Condition Transitions
  0x2f            : Informational Exceptions
  0x32            : Unkonwn Log Page
  0x34            : Unkonwn Log Page
  0x3b            : Unkonwn Log Page
# pyscsi log-sense /dev/sdb -p 0 -s 0xFF
issuing log sense command
/dev/sdb:

Log Page Name : Supported Log Pages and Subpages
page_code     : 0
subpage_code  : 255
spf           : 1
ds            : 0
page_length   : 16
Log Parameters:

Supported log pages and subpages  [0x0, 0xff]:
  0x0,0xff        : Supported Log Pages and Subpages
  0xd,0x0         : Temperature
  0xd,0x1         : Environmental Reporting
  0xd,0x2         : Environmental Limits
  0xd,0xff        : Unkonwn Log Page
  0x15,0x0        : Background Scan
  0x15,0x1        : Pending Defects
  0x15,0xff       : Unkonwn Log Page

2. examples to get temperature from SAS Disk
   Temperature locate in parameter_code = 0, bytes offset=1 of parameter_value. Bellow is bytearray(b'\x00$')[1] = 36 C

# pyscsi log-sense /dev/sdb -p 0x0D
issuing log sense command
/dev/sdb:

Log Page Name : Temperature
page_code     : 13
subpage_code  : 0
spf           : 0
ds            : 0
page_length   : 12
Log Parameters:

  parameter_code  : 0
  ctrl_bit        : 3
  parameter_length: 2
  parameter_value : bytearray(b'\x00$')
  --------------------------------------------------
  parameter_code  : 1
  ctrl_bit        : 3
  parameter_length: 2
  parameter_value : bytearray(b'\x00A')
  --------------------------------------------------

[jackeichen]

An example to get smart from NVMe Disk(like /dev/nvme0):

# pynvme smart-log /dev/nvme0
Critical Warning                        : 0x0
Composite Temperature(C)                : 33.85
Available Spare                         : 100
Available Spare Threshold               : 10
Percentage Used                         : 1
Endurance Group Critical Warning Summary: 0
Data Units Read                         : 4281379640
Data Units Written                      : 1842472492
Host Read Commands                      : 16727326231
Host Write Commands                     : 7201257168
Controller Busy Time                    : 651
Power Cycles                            : 1965
Power On Hours                          : 2602
Unsafe Shutdowns                        : 1843
Media and Data Integrity Errors         : 0
Number of Error Information Log Entries : 4
Warning Composite Temperature Time      : 0
Critical Composite Temperature Time     : 0