Miles Fidelman writes: > Stan Hoeppner wrote: >> On 11/9/2011 1:34 AM, Bob Proulx wrote: >>> Miles Fidelman wrote: >>>> try smartctl -A /dev/sda >>>> >>>> that will give you a much longer list of statistics collected by >>>> the drive >>>> >>>> the one I always look at first is the absolute value of "raw read >>>> errors" - if that's higher than 0, the drive is starting to fail, >>>> and its internal code is spending more and more time trying to read >>>> and re-read data off the media >>> Excellent information! >> Not really. The numbers are not absolutes. And they differ among >> manufacturers. S.M.A.R.T. is a data format standard for "drive >> health", but it does not dictate "value" standards for the field >> contents. >> >> For the end user, attempting to interpret some S.M.A.R.T. data for >> some makes of drives is hit or miss. I would say as a general rule >> that one should contact the drive manufacturer if s/he sees >> S.M.A.R.T. error counts rise. The drive may or may not be failing. > > Specifically for "raw read error" - in the format > > ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED > RAW_VALUE > 1 Raw_Read_Error_Rate 0x000b 088 088 062 Pre-fail Always - 3342368 > > I've found, across many different dries, that the "VALUE" field (which > is a relative field calculated over time) is generally useless, while > the RAW_VALUE field is almost always indicative of pending failure if > it's value is anything other than 0.
All my drives have a RAW_VALUE for that parameter not equal to 0: machine1$ sudo smartctl -A /dev/sdb | grep "Read\|Power_On" 1 Raw_Read_Error_Rate 0x000f 108 099 006 Pre-fail Always - 18696503 9 Power_On_Hours 0x0032 087 087 000 Old_age Always - 11987 machine1$ sudo smartctl -A /dev/sda | grep "Read\|Power_On" 1 Raw_Read_Error_Rate 0x000f 111 086 006 Pre-fail Always - 35575453 9 Power_On_Hours 0x0032 069 069 000 Old_age Always - 27906 Even with new drives: machine2$ sudo smartctl -A /dev/sdb | grep -e "Read\|Power_On" 1 Raw_Read_Error_Rate 0x000f 117 100 006 Pre-fail Always - 131149163 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 475 machine2$ sudo smartctl -A /dev/sdc | grep -e "Read\|Power_On" 1 Raw_Read_Error_Rate 0x000f 111 100 006 Pre-fail Always - 31090694 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 285 Those are all Seagate drives. Maybe their raw value means something different. -- Alberto -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87vcqtxxx8....@eps142.cdf.udc.es