ZyXEL Communications NAS540, User Manual

Page: 80 / 372

Chapter 8 Storage Manager
Cloud Storage User’s Guide
80
09 Power-On Hours
(POH) Low This is how many hours the hard drive has been in a power-on state. The
raw value lists the total number of hours (or minutes, or seconds
depending on the manufacturer).
10 Spin Retry Count Low This is the total number of spin start retry attempts. This 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.
11 Recalibration
Retries High This is the number of times recalibration was requested when the first
attempt did not succeed. A decrease in this value is an indicator of hard
disk mechanical subsystem problems.
12 Device Power
Cycle Count This is the number of times the hard drive has gone through a full power
on and power off.
13 Soft Read Error
Rate Low This is the number of uncorrected read errors the hard drive has
reported. If this is not zero, back up your data.
190 Airflow
Temperature
Low This indicates the temperature of the airflow measured by a Western
Digital hard drive.
190 Temperature
Difference from
100
High This indicates the value of 100 - the temperature in degrees Celsius.
Manufacturers can set a minimum threshold that corresponds to a
maximum temperature.
191 G-sense error
rate
Low This is the number of mistakes caused by impact loads.
192 Power-off Retract
Count
Low This is how many times the heads are loaded off the media.
193 Load/Unload
Cycle
Low This is the number of load and unload cycles into head landing zone
position.
194 Temperature Low This is the hard drive’s internal temperature.
195 Hardware ECC
Recovered
High This is the time between ECC (Error Correction Code)-corrected errors.
196 Reallocation
Event Count
Low This is the total number of reallocation (remap) operations. The raw value
is the total attempts to move data from reallocated sectors to a spare
area. Successful and unsuccessful attempts are both included.
197 Current Pending
Sector Count
Low This is the number of unstable sectors awaiting reallocation. If the sector
is later successfully written or read, this value decreases and reallocation
is not performed. Only failed write attempts cause a reallocation, not read
errors. This can be difficult to test since only direct I/O writes to the disk
cause reallocations, not cached writes.
198 Uncorrectable
Sector Count
Low This is the number of errors reading or writing a sector that were not
correctable. An increase in this value is an indicator of disk surface
defects or mechanical subsystem problems.
199 UltraDMA CRC
Error Count
Low This is the number of data transfer errors through the interface cable
according to the ICRC (Interface Cyclic Redundancy Check).
200 Write Error Rate
/ Multi-Zone
Error Rate
Low This is the total number of errors in writing sectors.
201 Soft Read Error
Rate
Low This is the number of read/write head off-track errors. If the value is not
zero, make a backup.
202 Data Address
Mark Errors
Low This is the number of data address mark errors. This could also be a
different, manufacturer-specific attribute.
203 Run Out Cancel Low This is the number of ECC (Error Correction Code) errors.
Table 21
S.M.A.R.T. Attributes (continued)
ID
ATTRIBUTE
NAME
BETTER DESCRIPTION