smartctl 的返回值是由8个比特位组成的 , 具体的解释参考本为末尾部分。
使用smartctl -H可以根据磁盘已经收集的信息检测磁盘的监控状态。返回的是一个数值类型。
返回值具体代表什么意思需要翻译成8个比特位，并查询smartctl的RETURN VALUES。
如果smartctl的输出了failing的健康状态的话, 表示磁盘已经failed或者将要在24小时内failed了.
1. 首先确保开启硬盘的几个选项 :
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, --health
Check: Ask the device to report its SMART health status or pending TapeAlert messages. SMART status is
based 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 the
TapeAlert log page.
If the device reports failing health status, this means either that the device has already failed, or
that it is predicting its own failure within the next 24 hours. If this happens, use the ′-a′ option to
get 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++)); do
echo "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以上这些比特位的含义见参考部分.
这个结果是PASSWD的但是返回值不是0, 而是4. (bit2 :1).
从源码ataprint.cpp部分来看 :
ataSmartStatus2(device) 这里的 ataSmartStatus2(device) 返回值并非0或-1.
所以到了如下代码段 :
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");【参考】
1. http://www.linuxjournal.com/article/6983
2. RETURN VALUES
The return values of smartctl are defined by a bitmask. If all is well with the disk, the return value (exit
status) of smartctl is 0 (all bits turned off). If a problem occurs, or an error, potential error, or fault is
detected, then a non-zero status is returned. In this case, the eight different bits in the return value have
the 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 newer
successful 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 following
type 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 $smartstat will be
nonzero if SMART status check returned "disk failing" and zero otherwise.
This bash script prints all status bits:
status=$?
for ((i=0; i<8; i++)); do
echo "Bit $i: $((status & 2**i && 1))"
done时间： 2024-09-08 03:30:51