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Chapter 4 Web Configurator Basics
Cloud Storage User’s Guide
66
4.4.6.1 S.M.A.R.T Attributes
The following table describes some common S.M.A.R.T. attributes. If a higher or lower raw attribute
value is better, it is indicated in the BETTER column. Since 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.
Updated
This indicates when the hard drive updates the value for this attribute.
•
Always means the hard drive updates this attribute during normal operation and
during offline activities.
•
Offline means the hard drive only updates this attribute when no one is accessing the
hard drive.
When Failed
This column indicates when (if ever) the attribute failed. An attribute has failed if the
normalized value is less than or equal to the threshold.
•
-: This displays if the attribute is not failing now and has never failed in the past.
•
FAILING_NOW: This displays if the attribute’s current normalized value is less than or
equal to the threshold.
•
In_the_past: This displays if the attribute’s current normalized value is greater than
the threshold but the worst recorded value is less than or equal to the threshold.
Raw Data
This is the attribute’s unprocessed raw data. These values show exact amounts of time or
numbers of attempts or errors. The meaning to the raw values is specific to the hard drive
manufacturer. Table 42 on page 156 has some information about whether a higher or lower
individual raw S.M.A.R.T. attribute value is better.
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Table 19
S.M.A.R.T Info
LABEL
DESCRIPTION
Table 20
S.M.A.R.T. Attributes
ID
ATTRIBUTE
NAME
BETTER
DESCRIPTION
01
Read Error Rate
Low
Shows the rate of hardware read errors. If this is not zero, there is a
problem with the disk surface or the read/write heads.
02
Throughput
Performance
High
This is the hard drive’s general (overall) throughput performance. A
decreasing value indicates a problem.
03
Spin-Up Time
Low
This is the average number of milliseconds the hard drive took for spindle
spin up (from zero RPM to fully operational).
04
Start/Stop Count
The total number of spindle start and stop cycles.
05
Reallocated
Sectors Count
Low
Total number of reallocated sectors on the hard drive. 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.
06
Read Channel
Margin
This is the margin of a channel when it reads data.
07
Seek Error Rate
Low
This is the rate of the magnetic heads’ seek errors. A 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.
08
Seek Time
Performance
High
This is an average performance indicator for the seek operations of the
magnetic heads. Mechanical subsystem problems cause this value to
decrease.
Summary of Contents for NAS Series
Page 4: ...Contents Overview Cloud Storage User s Guide 4 ...
Page 13: ...13 PART I User s Guide ...
Page 14: ...14 ...
Page 18: ...Chapter 1 Getting to Know Your NAS Cloud Storage User s Guide 18 ...
Page 26: ...Chapter 2 NAS Starter Utility Cloud Storage User s Guide 26 ...
Page 132: ...Chapter 5 Tutorials Cloud Storage User s Guide 132 5 Click Get Certificate ...
Page 152: ...Chapter 5 Tutorials Cloud Storage User s Guide 152 ...
Page 153: ...153 PART II Technical Reference ...
Page 154: ...154 ...
Page 158: ...Chapter 6 Status Screen Cloud Storage User s Guide 158 ...
Page 168: ...Chapter 7 System Setting Cloud Storage User s Guide 168 ...
Page 172: ...Chapter 8 External Volume Cloud Storage User s Guide 172 ...
Page 186: ...Chapter 9 Network Cloud Storage User s Guide 186 ...
Page 260: ...Chapter 14 Using Time Machine with the NAS Cloud Storage User s Guide 260 ...
Page 280: ...Chapter 17 Shares Cloud Storage User s Guide 280 ...
Page 284: ...Chapter 18 WebDAV Cloud Storage User s Guide 284 ...
Page 356: ...Appendix C Legal Information Cloud Storage User s Guide 356 Environmental Product Declaration ...