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List:       gentoo-user
Subject:    Re: [gentoo-user] hp H222 SAS controller
From:       Alan McKinnon <alan.mckinnon () gmail ! com>
Date:       2013-07-08 15:58:04
Message-ID: 51DAE18C.2010804 () gmail ! com
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On 08/07/2013 17:39, Paul Hartman wrote:
> On Thu, Jul 4, 2013 at 9:04 PM, Paul Hartman
> <paul.hartman+gentoo@gmail.com> wrote:
>> ST4000DM000
> 
> As a side-note these two Seagate 4TB "Desktop" edition drives I bought
> already, after about than 100 hours of power-on usage, both drives
> have each encountered dozens of unreadable sectors so far. I was able
> to correct them (force reallocation) using hdparm... So it should be
> "fixed", and I'm reading that this is "normal" with newer drives and
> "don't worry about it", but I'm still coming from the time when 1 bad
> sector = red alert, replace the drive ASAP.  I guess I will need to
> monitor and see if it gets worse.
> 


Way back when in the bad old days of drives measured in 100s of megs,
you'd get a few bad sectors now and then, and would have to mark them as
faulty. This didn't bother us then much

Nowadays we have drives that are 8,000 bigger than that so all other
things being equal we'd expect sectors to fail 8,000 time more (more
being a very fuzzy concept, and I know full well I'm using it loosely :-) )

Our drives nowadays also have smart firmware, something we had to
introduce when CHS no longer cut it, this lead to sector failures being
somewhat "invisible" leaving us with the happy delusion that drives were
vastly reliable etc etc etc. But you know all this.

A mere few dozen failures in the first 100 hours is a failure rate of
(Alan whips out the trust sci calculator) 4.8E-6%. Pretty damn
spectacular if you ask me and WELL within probabilities.

There is likely nothing wrong with your drives. If they are faulty, it's
highly likely a systemic manufacturing fault of the mechanicals (servo
systems, motor bearing etc)

You do realize that modern hard drives have for the longest time been up
there in the Top X list of Most Reliable Devices Made By Mankind Ever?



-- 
Alan McKinnon
alan.mckinnon@gmail.com


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