User Manual

Chapter 8 Storage Manager
Cloud Storage User’s Guide
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8.4 iSCSI
The NAS support s the iSCSI ( I nt ernet Sm all Com put er System I nterface) standard and can serve as
an iSCSI target . When t he iSCSI init iat or is successfully connected to an iSCSI t arget over an I P
204 Soft ECC
Corr ection
Low This is t he num ber of errors corrected by software ECC ( Error Correction
Code).
205 Therm al Asperit y
Rat e ( TAR)
Low This is t he num ber of t herm al asperit y errors. Therm al asperit y is a read
signal spike caused by sensor t em perat ure rise due t o touching the disk
surface or cont am inant part icles.
206 Flying Height This is t he height of t he hard dr ive’s read/ w rit e heads above t he disk
surface.
207 Spin High
Current
This is t he quant ity of high current used t o spin up t he drive.
208 Spin Buzz This is t he num ber of buzz routines t o spin up t he drive. When the arm
holding t he read/ writ e heads is st uck, the m ot or driving it t ries t o oscillat e
the arm to free it . This causes an audible vibration.
209 Offline Seek
Perform ance
This is t he hard drive’s seek perform ance during offline operations. Offline
operations are test s the drive does itself as opposed to t hose t hat an
ext ernal diagnost ic t ool has it do. Seek perform ance is how quickly t he
drive m oves from t rack to t rack.
220 Disk Shift Low This is how far t he disk has m oved relative t o the spindle ( this kind of
shift is usually due t o shock ).
221 G-Sense Err or
Rat e
Low This is t he num ber of errors that have resulted from external vibration
and shock.
222 Loaded Hours This is how long the hard drive has operated under data load ( this
requires m ovem ent of t he m agnetic head arm ature).
223 Load/ Unload
Ret r y Count
This is how m any tim e t he m agnet ic head has changed posit ion.
224 Load Friction Low This is resist ance caused by friction in m echanical part s during operat ion.
225 Load/ Unload
Cycle Count
Low This is t he t ot al num ber of load cycles.
226 Load 'I n'-t im e This is the tot al t im e t hat t he m agnetic heads act uat or has had a load
(not been in t he parking area) .
227 Torque
Am plificat ion
Count
Low This is t he num ber of att em pts t o com pensat e for variat ions in plat ter
speed.
228 Power- Off
Ret ract Cycle
Low This is how m any t im es the m agnetic arm ature was autom at ically
retract ed because t he power was cut .
230 GMR Head
Am plitude
This is t he am plit ude of t hrashing ( or t he dist ance of repetit ive forward
and reverse head m ot ion) .
231 Tem perature Low This is the hard drive’s t em perat ure.
240 Head Flying
Hours
This is t he tot al t im e t hat t he head has been posit ioning.
250 Read Err or Ret ry
Rat e
Low This is t he num ber of errors in reading from t he disk .
Table 21 S.M.A.R.T. At t ribut es ( cont inued)
ID
ATTRIBUTE
NAME
BETTER DESCRIPTION