ZyXEL NAS540 User Guide - Page 64
S.M.A.R.T Info, S.M.A.R.T Overview
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Chapter 4 Web Configurator Basics Click S.M.A.R.T Info in the S.M.A.R.T Overview screen to display the following. Figure 37 S.M.A.R.T Info The following table describes the labels in this screen. Table 19 S.M.A.R.T Info LABEL ID DESCRIPTION This is the identification number used to tag a hard disk attribute. Attribute Value This is standard across all S.M.A.R.T-enabled storage devices. However it depends on the storage vendor which attributes it will allow S.M.A.R.T to diagnose. This refers to an attribute of the hard disk that S.M.A.R.T can assess. Attributes describe the hard disk's physical state, performance, wear-and-tear, and so on. This is a value that corresponds to the Raw Data. Compare this with the Threshold. S.M.A.R.T compresses the raw value(s) into a digit from 1 to 253, where 1 indicates the worst scenario while 253 indicates the best scenario. Worst Threshold Type The values 100 or 200 usually represent the mean or normal value. This is the lowest value attained by the hard disk since S.M.A.R.T started its assessment of the hard disk. This is the attribute's threshold value. If the attribute's current normalized value is less than or equal to the threshold, the attribute has failed. An attribute value close to or below the threshold indicates the hard drive is no longer reliable. This shows S.M.A.R.T's assessment of the hard disk. Old_age indicates end-of-product life from old-age (normal wearing out) if the attribute value is less than or equal to the threshold. Pre-fail indicate imminent hard drive failure if the attribute value is less than or equal to the threshold. Note that just because an attribute is of the Pre-fail type does not mean your hard drive is ready to fail. It only means this if the current normalized value of the attribute is less than or equal to the threshold. 64 NAS540 User's Guide