On 09/11/11 12:50, Alberto Luaces wrote:
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.
Maybe. Power_On_Hours will be almost always be greater than zero, but
Raw_Read_Error_Rate is showing as zero on all my drives.
--
Dom
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