Date: Thu, 10 Feb 2011 15:07:31 -0500 From: Michael Powell <nightrecon@hotmail.com> To: freebsd-questions@freebsd.org Subject: Re: Bad hard driver [SOLVED] Message-ID: <ij1gfu$tk6$1@dough.gmane.org> References: <AANLkTinWDO%2B8%2ByLuOOb7fuF2YGQpoNZ--=9cM-XbGfbm@mail.gmail.com>
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Daniel Zhelev wrote: [snip] > > The last worrying thing is the > > 200 Multi_Zone_Error_Rate 0x0008 200 189 000 Old_age Offline > - 3 > > Which according to the Internet is some mysterious value that none knows > what it stands for, so is 3 of that mystery good? > Each cylinder track has a width. A head seek is nominally supposed to exactly center the head over the central axis. There is some slight tolerance as to accidental offset, but the maximum concentration of gaussian magnetic domain orientation should be concentrated in the center of each cylinder track. Temperature changes between cold and 'steady state' operation cause very small changes in the size of mechanical moving parts. A little slop factor will happen when read/write happens while a drive is warming up from cold. As long as the number remains small and doesn't change often it's probably nothing to worry over. If it does change a lot constantly it may be an indicator of worn mechanical parts. Such a thing should correlate with a large value of power on hours. A drive near the end of it's life may get wobbly head syndrome. :-) The main consideration in both questions is a small number that maybe increments every once in a blue moon is nothing to become overly concerned with. Rather consider them a long term baseline and only become alarmed when they show a rather sudden and large deviation in rate of change from the baseline. Generally when this occurs the numbers will change in fairly dramatic fashion quickly and generally continue this change from that point on. It is this pattern you look for as a possible "pre failure" warning. -Mike [snip]
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