Chapter 10 Package Management
S.M.A.R.T. attributes and their definitions vary by manufacturer, refer to the hard drive manufacturer for details about the attributes your hard drive supports.
Table 81 S.M.A.R.T. Attributes
ID | ATTRIBUTE | BETTE | DESCRIPTION | |
NAME | R | |||
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| |||
01 | Read Error | Low | Shows the rate of hardware read errors. If this is not | |
| Rate |
| zero, there is a problem with the disk surface or the | |
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|
| read/write heads. | |
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| |
02 | Throughput | High | This is the hard drive’s general (overall) throughput | |
| Performance |
| performance. A decreasing value indicates a problem. | |
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| |
03 | Low | This is the average number of milliseconds the hard drive | ||
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|
| took for spindle spin up (from zero RPM to fully | |
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| operational). | |
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| |
04 | Start/Stop |
| The total number of spindle start and stop cycles. | |
| Count |
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| |
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| |
05 | Reallocated | Low | Total number of reallocated sectors on the hard drive. | |
| Sectors Count |
| When the hard drive detects a read/write/verification | |
|
|
| error, it marks the sector as “reallocated” and transfers | |
|
|
| the data to a specially reserved (spare) area. The process | |
|
|
| is also known as remapping with “reallocated” sectors | |
|
|
| known as remaps. The more sectors the hard drive has to | |
|
|
| reallocate, the slower read and write speeds become. | |
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| |
06 | Read Channel |
| This is the margin of a channel when it reads data. | |
| Margin |
|
| |
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|
| |
07 | Seek Error | Low | This is the rate of the magnetic heads’ seek errors. A | |
| Rate |
| failure in the mechanical positioning system, such as | |
|
|
| servo damage or a thermal widening of the disk, results | |
|
|
| in seek errors. An increasing number of seek errors | |
|
|
| indicate the condition of the disk surface and the | |
|
|
| mechanical subsystem are worsening. | |
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|
|
| |
08 | Seek Time | High | This is an average performance indicator for the seek | |
| Performance |
| operations of the magnetic heads. Mechanical subsystem | |
|
|
| problems cause this value to decrease. | |
|
|
|
| |
09 | Low | This is how many hours the hard drive has been in a | ||
| Hours (POH) |
| ||
|
|
| hours (or minutes, or seconds depending on the | |
|
|
| manufacturer). | |
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|
| |
10 | Spin Retry | Low | This is the total number of spin start retry attempts. This | |
| Count |
| is the number of attempts to spin up to fully operational | |
|
|
| speed the hard drive has made when the first attempt did | |
|
|
| not succeed. An increase in this value is an indicator of | |
|
|
| hard disk mechanical subsystem problems. | |
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|
| |
11 | Recalibration | High | This is the number of times recalibration was requested | |
| Retries |
| when the first attempt did not succeed. A decrease in this | |
|
|
| value is an indicator of hard disk mechanical subsystem | |
|
|
| problems. | |
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| |
12 | Device Power |
| This is the number of times the hard drive has gone | |
| Cycle Count |
| through a full power on and power off. | |
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| |
13 | Soft Read Error | Low | This is the number of uncorrected read errors the hard | |
| Rate |
| drive has reported. If this is not zero, back up your data. | |
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NSA320 User’s Guide |
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