March 4, 201511 yr I finally installed Smart History on unMenu and it is flagging yellow practically all my disk for Power_on_Hours exceeding threshold. Here are the relevant warnings: WD-WCAZA4336067: WARNING - Power_On_Hours it is now 29032 (warning threshold is 20000) 6XW15Y6A: WARNING - Power_On_Hours it is now 36892 (warning threshold is 20000) S1LMJ90QC35509: *ERROR* - Power_On_Hours it is now 46778 (error threshold is 44000) WD-WMAZA6041844: WARNING - Power_On_Hours it is now 27497 (warning threshold is 20000) 9VP6J2BT: WARNING - Power_On_Hours it is now 39264 (warning threshold is 20000) WD-WCAZA0765138: WARNING - Power_On_Hours it is now 36984 (warning threshold is 20000) WD-WCAU46849918: *ERROR* - Power_On_Hours it is now 50406 (error threshold is 44000) I am particularly interested to know why some of these are "warnings" and some are "errors". Also, I have never been able to reliably get the server to power down and back up on Wake-on-LAN packets, but I know that the disks spend 99% of their time spun down, so the question is: does power down count spun down time? Would you worry about this or not? Thanks.
March 4, 201511 yr All drives fail eventually, the trick is accurately predicting when. The probability of a drive failing as it ages does increase, but other smart indicators are much more important. I'd be more worried about watching reallocated and pending sector counts. Power on hours includes spun up and spun down.
March 4, 201511 yr Power on hours are almost irrelevant. I have several drives with over 50,000 hours that are still going strong. Pay more attention to Start/Stop Count; Reallocated Sector Count; the Pending Sector counts; and any values that have dropped significantly below their nominal value (of either 100 or 200). Watch particularly for increasing number of reallocated sectors (not "bad", but an indication that more sectors are failing; and especially for pending sectors -- which are bad sectors that haven't yet been reallocated ... there are ways to force these to be reallocated, and you should do that when possible.
March 5, 201511 yr Google 'bathtub failure curve' for information on the significance of power-on hours. As Jonathanm said the problem is determining the hours at which the increase in failure rate occurs and how steep is its slope. It is different for every model of HD ever made! (And you can get any truly useful information until that model of HD has been manufacture discontinued.)
March 5, 201511 yr Google 'bathtub failure curve' for information on the significance of power-on hours. As Jonathanm said the problem is determining the hours at which the increase in failure rate occurs and how steep is its slope. It is different for every model of HD ever made! (And you can get any truly useful information until that model of HD has been manufacture discontinued.) There are three kinds of lies: lies, damned lies, and statistics - Mark Twain
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