CaptainSpalding Posted March 21, 2013 Share Posted March 21, 2013 Hi! I just took couple of hdd's from my unraid config and saw that they had been running for almost 3000 hours... One other disc I had had 3300 hours and was not in a good shape. Is there a simple way to check what is the "oldest" drive in the array? Quote Link to comment
RobJ Posted March 23, 2013 Share Posted March 23, 2013 Check the SMART reports for all drives. The Raw_Value for attribute 9 Power_On_Hours is the number of operational hours for the drive. So long as the drive is not too old, that is the correct number. Some of the makers of the older drives (500GB or less) were inconsistent with this attribute, but recent hour numbers should be reliable. Quote Link to comment
CaptainSpalding Posted March 23, 2013 Author Share Posted March 23, 2013 Thanks! Quote Link to comment
wsume99 Posted March 23, 2013 Share Posted March 23, 2013 Power_On_Hours represents the time that the drive was powered and not the hours it was actually spinning, correct? So that SMART attribute is not very useful if your drives are spun down for a large portion of the day. Quote Link to comment
RobJ Posted March 24, 2013 Share Posted March 24, 2013 Power_On_Hours represents the time that the drive was powered and not the hours it was actually spinning, correct? So that SMART attribute is not very useful if your drives are spun down for a large portion of the day. That's a good question. I've always thought it was actual spinning hours, not spun down but powered on time. Easy enough to test. My system is down temporarily. Could someone grab a SMART report, spin a drive down, wait 3 or 4 hours, then spin it back up and grab another SMART report and compare? Quote Link to comment
Automatic Posted March 24, 2013 Share Posted March 24, 2013 Power_On_Hours represents the time that the drive was powered and not the hours it was actually spinning, correct? So that SMART attribute is not very useful if your drives are spun down for a large portion of the day. That's a good question. I've always thought it was actual spinning hours, not spun down but powered on time. Easy enough to test. My system is down temporarily. Could someone grab a SMART report, spin a drive down, wait 3 or 4 hours, then spin it back up and grab another SMART report and compare? I would, but, mine is preclearing drives. Anyway, wouldn't it depend on the hard drive's manufacturer? Quote Link to comment
S80_UK Posted March 24, 2013 Share Posted March 24, 2013 My WD20EARS and WD10EADS drives all report hours powered, regardless of whether they are spinning or not. How do I know... They are spun down over 90% of the time, but still clock up over 8000 hours a year. I get the info from the Smart report on the myMain page of unMenu. (It's also handy for load cycle count and start-stop count monitoring.) Quote Link to comment
wsume99 Posted March 24, 2013 Share Posted March 24, 2013 My WD20EARS and WD10EADS drives all report hours powered, regardless of whether they are spinning or not. How do I know... They are spun down over 90% of the time, but still clock up over 8000 hours a year. I get the info from the Smart report on the myMain page of unMenu. (It's also handy for load cycle count and start-stop count monitoring.) I have all WD20EARS drives in my server and I see the exact same behavior. Not sure how the other OEMs calculate Power_On_Hours but I'd be surprised if it was different. Quote Link to comment
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