From: Bob T. <rd...@cs...> - 2007-11-05 18:22:31
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smartctl returns a raw count of over a million for this attribute on my laptop drive. The spec sheet for the drive http://www.seagate.com/support/disc/manuals/ata/momentus_pm.pdf doesn't mention load/unload cycles but specifies 300K as the "software-controlled power on/off cycles" under good conditions. Are these comparable? There's been a lot of uninformed (I believe) bunk published recently on this; e.g., http://www.tectonic.co.za/view.php?src=rss&id=1854 Somebody knowledgeable should clarify whether there really is a wear issue with aggressive (manufacturer-default) power-handling or not. Bob T. |
From: Bruce A. <ba...@gr...> - 2007-11-06 09:57:12
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Hi Bob, I don't know much about this topic. But I think it's wise to monitor the number of load/unload cycles. Seeing the rate at which the normalized SMART attribute decreases should give some idea about how the disk manufacturer thinks that this impacts the disk's service life. Cheers, Bruce On Mon, 5 Nov 2007, Bob Tennent wrote: > smartctl returns a raw count of over a million for this attribute on my > laptop drive. The spec sheet for the drive > > http://www.seagate.com/support/disc/manuals/ata/momentus_pm.pdf > > doesn't mention load/unload cycles but specifies 300K as the > "software-controlled power on/off cycles" under good conditions. Are > these comparable? There's been a lot of uninformed (I believe) bunk > published recently on this; e.g., > > http://www.tectonic.co.za/view.php?src=rss&id=1854 > > Somebody knowledgeable should clarify whether there really is a wear > issue with aggressive (manufacturer-default) power-handling or not. > > Bob T. > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Smartmontools-support mailing list > Sma...@li... > https://lists.sourceforge.net/lists/listinfo/smartmontools-support > |
From: Bob T. <rd...@cs...> - 2007-11-06 12:29:56
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>|Seeing the rate at which the normalized >|SMART attribute decreases should give some idea about how the disk >|manufacturer thinks that this impacts the disk's service life. Hmm. Currently the VALUE is 001 and the THRESH is 000 for Load_Cycle_Count. Does that mean the drive is just about ready to fail or merely that it's a binary attribute? Bob T. |
From: Bruce A. <ba...@gr...> - 2007-11-06 12:32:41
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It means that the Attribute can never fail. VALUE is already the smallest permitted value (ATA-3 specs don't let it go less than 1). On Tue, 6 Nov 2007, Bob Tennent wrote: > >|Seeing the rate at which the normalized > >|SMART attribute decreases should give some idea about how the disk > >|manufacturer thinks that this impacts the disk's service life. > > Hmm. Currently the VALUE is 001 and the THRESH is 000 for > Load_Cycle_Count. Does that mean the drive is just about ready to fail > or merely that it's a binary attribute? > > Bob T. > |
From: Bob T. <rd...@cs...> - 2007-11-06 12:59:59
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>|It means that the Attribute can never fail. VALUE is already the >|smallest permitted value (ATA-3 specs don't let it go less than 1). If "the Attribute can never fail" and there's nothing in the specification sheet about it (apparently), I conclude that all the recent hullabaloo about Load_Cycle_Count really is bunk. Thanks, Bob T. >|> Hmm. Currently the VALUE is 001 and the THRESH is 000 for >|> Load_Cycle_Count. Does that mean the drive is just about ready to >|> fail or merely that it's a binary attribute? |
From: Bruce A. <ba...@gr...> - 2007-11-06 14:39:15
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Bob, > >|> Hmm. Currently the VALUE is 001 and the THRESH is 000 for > >|> Load_Cycle_Count. Does that mean the drive is just about ready to > >|> fail or merely that it's a binary attribute? > > >|It means that the Attribute can never fail. VALUE is already the > >|smallest permitted value (ATA-3 specs don't let it go less than 1). > > If "the Attribute can never fail" and there's nothing in the > specification sheet about it (apparently), I conclude that all the > recent hullabaloo about Load_Cycle_Count really is bunk. Perhaps for YOUR disk, yes. Other disks have different Attribute behaviors. On many of those disks, the THRESH value is greater than zero. On such disks, the Attribute CAN fail. Cheers, Bruce |
From: Rui T. M. <tia...@gm...> - 2007-11-06 17:14:15
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On 11/6/07, Bruce Allen <ba...@gr...> wrote: > Perhaps for YOUR disk, yes. Other disks have different Attribute > behaviors. On many of those disks, the THRESH value is greater than zero. > On such disks, the Attribute CAN fail. So, if I have this: 193 Load_Cycle_Count 0x0022 088 088 000 Old_age Always - 24113 It means that the manufacturer says that this attribute can't fail, right? But still, they have on their spec sheet for this drive on the Reliability section: Load/Unload (U/UL) 600,000 software-controlled power on/off cycles 20,000 hard power on/off cycles And this drive did ~24000 load cycles in ~200 hours of use which is ~2 per minute of use. Hmmm, I guess I should stop worrying or something :-| Rui |