smartctl -S on -s on -o on /dev/sdd
[root@db-172-16-3-150 ~]# /opt/smartmontools-6.0/sbin/smartctl -S on -s on -o on /dev/sdd
smartctl 6.0 2012-10-10 r3643 [x86_64-linux-2.6.18-274.el5] (local build)
Copyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org=== START OF ENABLE/DISABLE COMMANDS SECTION ===
SMART Enabled.
SMART Attribute Autosave Enabled.
SMART Automatic Offline Testing Enabled every four hours.

2. smartctl健康检查选项 :

       -H, --healthCheck: Ask the device to report its SMART health status or pending TapeAlert messages.  SMART status  isbased  on  information  that  it  has  gathered from online and offline tests, which were used to deter-mine/update its SMART vendor-specific Attribute values. TapeAlert status  is  obtained  by  reading  theTapeAlert log page.If  the  device  reports failing health status, this means either that the device has already failed, orthat it is predicting its own failure within the next 24 hours.  If this happens, use the ′-a′ option toget more information, and get your data off the disk and to someplace safe as soon as you can.

健康检查示例 :

[root@db-172-16-3-150 ~]# /opt/smartmontools-6.0/sbin/smartctl -H /dev/sdd
smartctl 6.0 2012-10-10 r3643 [x86_64-linux-2.6.18-274.el5] (local build)
Copyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
返回值 :
[root@db-172-16-3-150 ~]# echo $?
0

或者仅输出错误 :

[root@db-172-16-3-150 ~]# /opt/smartmontools-6.0/sbin/smartctl -H -q errorsonly /dev/sdd
[root@db-172-16-3-150 ~]# 

3. 返回值解析脚本 :

[root@db-172-16-3-150 ~]# cat smart.sh
/opt/smartmontools-6.0/sbin/smartctl -H -d sat+megaraid,2 /dev/sdb
status=$?
for ((i=0; i<8; i++)); doecho "Bit $i: $((status & 2**i && 1))"
done

执行这个shell script :

[root@db-172-16-3-150 ~]# . ./smart.sh
smartctl 6.0 2012-10-10 r3643 [x86_64-linux-2.6.18-274.el5] (local build)
Copyright (C) 2002-12, 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.Bit 0: 0
Bit 1: 0
Bit 2: 1
Bit 3: 0
Bit 4: 0
Bit 5: 0
Bit 6: 0
Bit 7: 0

    default:// Something went wrong with the SMART STATUS command.// The ATA SMART RETURN STATUS command provides the result in the ATA output// registers. Buggy ATA/SATA drivers and SAT Layers often do not properly// return the registers values.failuretest(OPTIONAL_CMD, returnval|=FAILSMART);if (!(smart_val_ok && smart_thres_ok)) {print_on();pout("SMART overall-health self-assessment test result: UNKNOWN!\n""SMART Status, Attributes and Thresholds cannot be read.\n\n");}else if (find_failed_attr(&smartval, &smartthres, attribute_defs, 1)) {print_on();pout("SMART overall-health self-assessment test result: FAILED!\n""Drive failure expected in less than 24 hours. SAVE ALL DATA.\n");print_off();returnval|=FAILATTR;returnval|=FAILSTATUS;if (options.smart_vendor_attrib)pout("See vendor-specific Attribute list for failed Attributes.\n\n");else {print_on();pout("Failed Attributes:\n");PrintSmartAttribWithThres(&smartval, &smartthres, attribute_defs, rpm, 1, options.output_format);}}else {pout("SMART overall-health self-assessment test result: PASSED\n");pout("Warning: This result is based on an Attribute check.\n");

       The  return  values of smartctl are defined by a bitmask.  If all is well with the disk, the return value (exitstatus) of smartctl is 0 (all bits turned off).  If a problem occurs, or an error, potential error, or fault isdetected,  then a non-zero status is returned.  In this case, the eight different bits in the return value havethe following meanings for ATA disks; some of these values may also be returned for SCSI disks.Bit 0: Command line did not parse.Bit 1: Device open failed, device did not return an IDENTIFY DEVICE structure, or device is in a low-power mode(see ′-n′ option above).Bit 2: Some SMART or other ATA command to the disk failed, or there was a checksum error in a SMART data struc-ture (see ′-b′ option above).Bit 3: SMART status check returned "DISK FAILING".Bit 4: We found prefail Attributes <= threshold.Bit 5: SMART status check returned "DISK OK" but we found that some (usage or prefail) Attributes have been  <=threshold at some time in the past.Bit 6: The device error log contains records of errors.Bit 7: The  device  self-test log contains records of errors.  [ATA only] Failed self-tests outdated by a newersuccessful extended self-test are ignored.To test within the shell for whether or not the different bits are turned on or off, you can use the  followingtype of construction (this is bash syntax):smartstat=$(($? & 8))This  looks  at  only  at  bit  3  of the exit status $?  (since 8=2^3).  The shell variable $smartstat will benonzero if SMART status check returned "disk failing" and zero otherwise.This bash script prints all status bits:status=$?for ((i=0; i<8; i++)); doecho "Bit $i: $((status & 2**i && 1))"done