Wrapper for smartctl (smartmontools)
Copyright (C) 2015 Marc Herndon
pySMART is a simple Python wrapper for the smartctl component of smartmontools. It works under Linux and Windows, as long as smartctl is on the system path. Running with administrative rights is strongly recommended, as smartctl cannot accurately detect all device types or parse all SMART information without these permissions.
With only a device’s name (ie: /dev/sda, pd0), the package will create a Device object, populated with all relevant information about that device. The documented API can then be used to query this object for information, initiate self-tests, and perform other functions.
The most common way to use pySMART is to create a logical representation of the physical storage device that you would like to work with, as shown:
>>> from pySMART import Device >>> sda = Device('/dev/sda') >>> sda <SATA device on /dev/sda mod:WDC WD5000AAKS-60Z1A0 sn:WD-WCAWFxxxxxxx>
Device class members can be accessed directly, and a number of helper methods are provided to retrieve information in bulk. Some examples are shown below:
>>> sda.assessment # Query the SMART self-assessment 'PASS' >>> sda.attributes # Query a single SMART attribute <SMART Attribute 'Power_On_Hours' 068/000 raw:23644> >>> sda.all_attributes() # Print the entire SMART attribute table ID# ATTRIBUTE_NAME CUR WST THR TYPE UPDATED WHEN_FAIL RAW 1 Raw_Read_Error_Rate 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 141 140 021 Pre-fail Always - 3908 4 Start_Stop_Count 098 098 000 Old_age Always - 2690 5 Reallocated_Sector_Ct 200 200 140 Pre-fail Always - 0 ... # Edited for brevity 199 UDMA_CRC_Error_Count 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 200 200 000 Old_age Offline - 0 >>> sda.tests # Query the most recent self-test result <SMART Self-test [Short offline|Completed without error] hrs:23734 LBA:-> >>> sda.all_selftests() # Print the entire self-test log ID Test_Description Status Left Hours 1st_Error@LBA 1 Short offline Completed without error 00% 23734 - 2 Short offline Completed without error 00% 23734 - ... # Edited for brevity 7 Short offline Completed without error 00% 23726 - 8 Short offline Completed without error 00% 1 -
Alternatively, the package provides a DeviceList class. When instantiated, this will auto-detect all local storage devices and create a list containing one Device object for each detected storage device:
>>> from pySMART import DeviceList >>> devlist = DeviceList() >>> devlist <DeviceList contents: <SAT device on /dev/sdb mod:WDC WD20EADS-00R6B0 sn:WD-WCAVYxxxxxxx> <SAT device on /dev/sdc mod:WDC WD20EADS-00S2B0 sn:WD-WCAVYxxxxxxx> <CSMI device on /dev/csmi0,0 mod:WDC WD5000AAKS-60Z1A0 sn:WD-WCAWFxxxxxxx> > >>> devlist.devices.attributes # Access Device data as above <SMART Attribute 'Reallocated_Sector_Ct' 173/140 raw:214>
Using the pySMART wrapper, Python applications be be rapidly developed to take advantage of the powerful features of smartmontools.
pySMART is available on PyPI and installable via pip:
python -m pip install pySMART
The only external dependency is the smartctl component of the smartmontools package. This should be pre-installed in most Linux distributions, or it can be obtained through your package manager. Likely one of the following:
apt-get install smartmontools or yum install smartmontools
On Windows PC’s, smartmontools must be downloaded and installed. The latest version can be obtained from the project’s homepage, http://www.smartmontools.org/.
Note that after installing smartmontools on Windows, the directory containing smartctl.exe must be added to the system path, if it is not already.
API documentation for pySMART was generated using pdoc and can be found in the /docs folder within the package archive.
I would like to thank the entire team behind smartmontools for creating and maintaining such a fantastic product.
In particular I want to thank Christian Franke, who maintains the Windows port of the software. For several years I have written Windows batch files that rely on smartctl.exe to automate evaluation and testing of large pools of storage devices. Without his work, my job would have been significantly more miserable. :)
Having recently migrated my script development from Batch to Python for Linux portabiity, I thought a simple wrapper for smartctl would save time in the development of future automated test tools.
Final Note on Licensing
If you are reading this and thinking that you’d love to use pySMART if only it weren’t “restricted” by GPL licensing, please contact me. I am very willing to make the code available privately under a more permissive license, including for some corporate or commercial uses. I’d just like for you to say hello first, and tell me a bit about your project and how pySMART could fit into it. Odds are I’d be happy to help.
I’ve been contacted with similar requests a handful of times previously, so I decided to add this note in case there are others out there afraid to ask.