SAS - Sectors Read/Written - When should I start worring... News at 11..

EE-Wizards,

I have a RAID made up of 15K SAS 450GB HDDs (12 in total).  I ran a report and the Sectors Read and Written appear to be astronomically high - For Sectors Read - Average 48 BILLION.
+========================================================+
Average      48,404,496,935.63
StdDev      11,522,798,530.28
      
LOW      36,881,698,405.35
HIGH      59,927,295,465.91
+========================================================+
Written:
Average      18,414,544,352.34
StdDev      3,413,528,417.53
      
LOW      15,001,015,934.81
HIGH      21,828,072,769.87
+========================================================+

At what point should I start to worry about chronic disk failures?

Inquiring minds would like to know..

Rojosho
LVL 7
RojoshoRTCC-III Level-2 SupportAsked:
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rindiCommented:
That isn't a criteria you should look at. Disks include SMART, which is a kind of counter for different critical values within the disk. once certain thresholds are reached you disk controller is told about it and then you should get a message that a disk failure is imminent. That is when the disk should be replaced. Usually SMART will trip before the disk breaks, so you can react in time.

Better though than SMART is to use the disk manufacturer's diagnostic tool, which will also do an extended surface test (SMART is very basic and can't do that), and these tools then tell you if there are any other serious problems which SMART didn't. The problem is that those tools usually only work on standard (non RAID) setups, so in servers you are limited to using SMART for failure prediction.
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RojoshoRTCC-III Level-2 SupportAuthor Commented:
Good answer, thank you.
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