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+
+
+Smartctl (Self-Monitoring, Analysis and Reporting Technology) is a command line 
+utility where smart disks can be checked for errors and info extracted.
+
+
+##Example:1 Check Whether Smart Capability is enabled or not for the disk##
+
+`$ smartctl -i /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF INFORMATION SECTION ===`
+`Model Family:     Seagate Momentus 5400.6`
+`Device Model:     ST9320325AS`
+`Serial Number:    5VD2V59T`
+`LU WWN Device Id: 5 000c50 020a37ec4`
+`Firmware Version: 0002BSM1`
+`User Capacity:    320,072,933,376 bytes [320 GB]`
+`Sector Size:      512 bytes logical/physical`
+`Rotation Rate:    5400 rpm`
+`Device is:        In smartctl database [for details use: -P show]`
+`ATA Version is:   ATA8-ACS T13/1699-D revision 4`
+`SATA Version is:  SATA 2.6, 1.5 Gb/s`
+`Local Time is:    Sun Nov 16 12:32:09 2014 IST`
+`SMART support is: Available - device has SMART capability.`
+`SMART support is: Enabled``
+
+Where `/dev/sdb` is your hard disk. 
+
+##Example:2 Enable Smart Capability for the disk##
+
+`$ smartctl -s on /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF ENABLE/DISABLE COMMANDS SECTION ===`
+`SMART Enabled.`
+
+##Example:3 Disable Smart Capability for the disk##
+
+`$ smartctl -s off  /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF ENABLE/DISABLE COMMANDS SECTION ===`
+`SMART Disabled. Use option -s with argument 'on' to enable it.`
+
+##Example:4 Display Detailed Smart info for the disk##
+
+`$ smartctl -a /dev/sdb              // For IDE drive`
+`$ smartctl -a -d ata /dev/sdb       // For SATA drive`
+
+##Example:5 Display Overall health of the Disk##
+
+`$ smartctl -H  /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF READ SMART DATA SECTION ===`
+`SMART overall-health self-assessment test result: PASSED`
+`Warning: This result is based on an Attribute check.`
+`Please note the following marginal Attributes:`
+`ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE`
+`190 Airflow_Temperature_Cel 0x0022   067   045   045    Old_age   Always   In_the_past 33 (Min/Max 25/33)`
+``
+##Example:6 Test Hard drive using long & short option.##
+
+__Long Test__
+
+`$ smartctl --test=long /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION ===`
+`Sending command: "Execute SMART Extended self-test routine immediately in off-line mode".`
+`Drive command "Execute SMART Extended self-test routine immediately in off-line mode" successful.`
+`Testing has begun.`
+`Please wait 102 minutes for test to complete.`
+`Test will complete after Sun Nov 16 14:29:43 2014`
+``
+`Use smartctl -X to abort test.`
+
+OR We can redirect test output to a log file , as shown below
+
+`$ smartctl --test=long /dev/sdb > /var/log/long.text`
+
+__Short Test__
+
+`$ smartctl --test=short /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION ===`
+`Sending command: "Execute SMART Short self-test routine immediately in off-line mode".`
+`Drive command "Execute SMART Short self-test routine immediately in off-line mode" successful.`
+`Testing has begun.`
+`Please wait 1 minutes for test to complete.`
+`Test will complete after Sun Nov 16 12:51:45 2014`
+``
+`Use smartctl -X to abort test.`
+
+OR
+
+`$ smartctl --test=short /dev/sdb > /var/log/short.text`
+
+Note : Short test will take maximum 2 minutes whereas in long test there is no time restriction because it read & verify every segment of the entire disk.
+
+##Example:7 To View Drive’s Self Test result##
+
+`$ smartctl -l selftest /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF READ SMART DATA SECTION ===`
+`SMART Self-test log structure revision number 1`
+`Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error`
+`# 1  Short offline       Completed: read failure       90%       492         210841222`
+`# 2  Extended offline    Completed: read failure       90%       492         210841222`
+
+##Example:8 Calculate Estimate time to perform test##
+
+`$ smartctl -c  /dev/sdb`
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF READ SMART DATA SECTION ===`
+`General SMART Values:`
+`Offline data collection status:  (0x00)    Offline data collection activity`
+`                    was never started.`
+`                    Auto Offline Data Collection: Disabled.`
+`Self-test execution status:      ( 121)    The previous self-test completed having`
+`                    the read element of the test failed.`
+`Total time to complete Offline `
+`data collection:         (    0) seconds.`
+`Offline data collection`
+`capabilities:              (0x73) SMART execute Offline immediate.`
+`                    Auto Offline data collection on/off support.`
+`                    Suspend Offline collection upon new`
+`                    command.`
+`                    No Offline surface scan supported.`
+`                    Self-test supported.`
+`                    Conveyance Self-test supported.`
+`                    Selective Self-test supported.`
+`SMART capabilities:            (0x0003)    Saves SMART data before entering`
+`                    power-saving mode.`
+`                    Supports SMART auto save timer.`
+`Error logging capability:        (0x01)    Error logging supported.`
+`                    General Purpose Logging supported.`
+`Short self-test routine `
+`recommended polling time:      (   1) minutes.`
+`Extended self-test routine`
+`recommended polling time:      ( 102) minutes.`
+`Conveyance self-test routine`
+`recommended polling time:      (   2) minutes.`
+`SCT capabilities:            (0x103b)    SCT Status supported.`
+`                    SCT Error Recovery Control supported.`
+`                    SCT Feature Control supported.`
+`                    SCT Data Table supported.`
+
+##Example:9 Display Error logs of the disk##
+
+`$ smartctl -l error  /dev/sdb`
+
+Sample Output
+
+`smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-32-generic] (local build)`
+`Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org`
+``
+`=== START OF READ SMART DATA SECTION ===`
+`SMART Error Log Version: 1`
+`ATA Error Count: 5`
+`    CR = Command Register [HEX]`
+`    FR = Features Register [HEX]`
+`    SC = Sector Count Register [HEX]`
+`    SN = Sector Number Register [HEX]`
+`    CL = Cylinder Low Register [HEX]`
+`    CH = Cylinder High Register [HEX]`
+`    DH = Device/Head Register [HEX]`
+`    DC = Device Command Register [HEX]`
+`    ER = Error register [HEX]`
+`    ST = Status register [HEX]`
+`Powered_Up_Time is measured from power on, and printed as`
+`DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,`
+`SS=sec, and sss=millisec. It "wraps" after 49.710 days.`
+``
+`Commands leading to the command that caused the error were:`
+`  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name`
+`  -- -- -- -- -- -- -- --  ----------------  --------------------`
+`  25 da 08 e7 e5 a5 4c 00      00:30:44.515  READ DMA EXT`
+`  25 da 08 df e5 a5 4c 00      00:30:44.514  READ DMA EXT`
+`  25 da 80 5f e5 a5 4c 00      00:30:44.502  READ DMA EXT`
+`  25 da f0 5f e6 a5 4c 00      00:30:44.496  READ DMA EXT`
+`  25 da 10 4f e6 a5 4c 00      00:30:44.383  READ DMA EXT`
+